diff --git a/sqlTranslate/.idea/workspace.xml b/sqlTranslate/.idea/workspace.xml
index ce358510a..1e1f96cea 100644
--- a/sqlTranslate/.idea/workspace.xml
+++ b/sqlTranslate/.idea/workspace.xml
@@ -6,7 +6,6 @@
   <component name="ChangeListManager">
     <list default="true" id="d8d12963-4777-48e3-9669-309cf5e41d60" name="更改" comment="revise">
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/Main.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/Main.java" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/src/main/java/Parser/OracleParser.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/Parser/OracleParser.java" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
@@ -105,13 +104,6 @@
       <option name="presentableId" value="Default" />
       <updated>1723106789329</updated>
     </task>
-    <task id="LOCAL-00004" summary="add AST node">
-      <created>1723992163694</created>
-      <option name="number" value="00004" />
-      <option name="presentableId" value="LOCAL-00004" />
-      <option name="project" value="LOCAL" />
-      <updated>1723992163694</updated>
-    </task>
     <task id="LOCAL-00005" summary="add functions">
       <created>1724145125754</created>
       <option name="number" value="00005" />
@@ -448,7 +440,14 @@
       <option name="project" value="LOCAL" />
       <updated>1726197698087</updated>
     </task>
-    <option name="localTasksCounter" value="53" />
+    <task id="LOCAL-00053" summary="revise">
+      <created>1726198053495</created>
+      <option name="number" value="00053" />
+      <option name="presentableId" value="LOCAL-00053" />
+      <option name="project" value="LOCAL" />
+      <updated>1726198053495</updated>
+    </task>
+    <option name="localTasksCounter" value="54" />
     <servers />
   </component>
   <component name="Vcs.Log.Tabs.Properties">
diff --git a/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterAddColumnNode.java b/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterAddColumnNode.java
index cf2c2e69d..0451f2586 100644
--- a/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterAddColumnNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterAddColumnNode.java
@@ -28,9 +28,9 @@ public class AlterAddColumnNode extends ASTNode {
     @Override
     public void visit(ASTNode node, StringBuilder queryString) {
         queryString.append(toString() + " ");
-        for (ASTNode child : getChildren())
-
+        for (ASTNode child : getChildren()) {
             child.visit(child, queryString);
+        }
     }
 
     public Token getName() {
diff --git a/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterAddConstraintNode.java b/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterAddConstraintNode.java
index e070e5703..bb4adf9d8 100644
--- a/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterAddConstraintNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterAddConstraintNode.java
@@ -17,8 +17,8 @@ public class AlterAddConstraintNode extends ASTNode {
     @Override
     public void visit(ASTNode node, StringBuilder queryString) {
         queryString.append(toString() + " ");
-        for (ASTNode child : getChildren())
-
+        for (ASTNode child : getChildren()) {
             child.visit(child, queryString);
+        }
     }
 }
diff --git a/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterDropColumnNode.java b/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterDropColumnNode.java
index 120116cfb..712ebcc18 100644
--- a/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterDropColumnNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterDropColumnNode.java
@@ -18,8 +18,8 @@ public class AlterDropColumnNode extends ASTNode {
     @Override
     public void visit(ASTNode node, StringBuilder queryString) {
         queryString.append(toString() + " ");
-        for (ASTNode child : getChildren())
-
+        for (ASTNode child : getChildren()) {
             child.visit(child, queryString);
+        }
     }
 }
diff --git a/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterDropConstraintNode.java b/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterDropConstraintNode.java
index b32ad2a67..88cdffce7 100644
--- a/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterDropConstraintNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterDropConstraintNode.java
@@ -17,8 +17,8 @@ public class AlterDropConstraintNode extends ASTNode {
     @Override
     public void visit(ASTNode node, StringBuilder queryString) {
         queryString.append(toString() + " ");
-        for (ASTNode child : getChildren())
-
+        for (ASTNode child : getChildren()) {
             child.visit(child, queryString);
+        }
     }
 }
diff --git a/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterModifyColumnNode.java b/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterModifyColumnNode.java
index 49a7d0f4e..62ff0fba8 100644
--- a/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterModifyColumnNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterModifyColumnNode.java
@@ -6,6 +6,13 @@ import Parser.AST.ASTNode;
 import java.util.List;
 
 public class AlterModifyColumnNode extends ASTNode {
+    private Token columnName;
+    private Token columnType;
+
+    public AlterModifyColumnNode() {
+        super();
+    }
+
     public AlterModifyColumnNode(ASTNode node) {
         super(node);
     }
@@ -14,11 +21,27 @@ public class AlterModifyColumnNode extends ASTNode {
         super(tokens);
     }
 
+    public void setColumnType(Token columnType) {
+        this.columnType = columnType;
+    }
+
+    public Token getColumnType() {
+        return columnType;
+    }
+
+    public void setColumnName(Token columnName) {
+        this.columnName = columnName;
+    }
+
+    public Token getColumnName() {
+        return columnName;
+    }
+
     @Override
     public void visit(ASTNode node, StringBuilder queryString) {
         queryString.append(toString() + " ");
-        for (ASTNode child : getChildren())
-
+        for (ASTNode child : getChildren()) {
             child.visit(child, queryString);
+        }
     }
 }
diff --git a/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterNode.java b/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterNode.java
index 23c795a90..1a7704078 100644
--- a/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterNode.java
@@ -17,8 +17,8 @@ public class AlterNode extends ASTNode {
     @Override
     public void visit(ASTNode node, StringBuilder queryString) {
         queryString.append(toString() + " ");
-        for (ASTNode child : getChildren())
-
+        for (ASTNode child : getChildren()) {
             child.visit(child, queryString);
+        }
     }
 }
diff --git a/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterObjNode.java b/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterObjNode.java
index c1a06a720..5149a0b09 100644
--- a/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterObjNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterObjNode.java
@@ -17,8 +17,8 @@ public class AlterObjNode extends ASTNode {
     @Override
     public void visit(ASTNode node, StringBuilder queryString) {
         queryString.append(toString() + " ");
-        for (ASTNode child : getChildren())
-
+        for (ASTNode child : getChildren()) {
             child.visit(child, queryString);
+        }
     }
 }
diff --git a/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterRenameColumnNode.java b/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterRenameColumnNode.java
index 8295026a7..32a11f4c1 100644
--- a/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterRenameColumnNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterRenameColumnNode.java
@@ -17,8 +17,8 @@ public class AlterRenameColumnNode extends ASTNode {
     @Override
     public void visit(ASTNode node, StringBuilder queryString) {
         queryString.append(toString() + " ");
-        for (ASTNode child : getChildren())
-
+        for (ASTNode child : getChildren()) {
             child.visit(child, queryString);
+        }
     }
 }
diff --git a/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterRenameTableNode.java b/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterRenameTableNode.java
index 049fed275..85a5c6528 100644
--- a/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterRenameTableNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/AlterTable/AlterRenameTableNode.java
@@ -17,8 +17,8 @@ public class AlterRenameTableNode extends ASTNode {
     @Override
     public void visit(ASTNode node, StringBuilder queryString) {
         queryString.append(toString() + " ");
-        for (ASTNode child : getChildren())
-
+        for (ASTNode child : getChildren()) {
             child.visit(child, queryString);
+        }
     }
 }
diff --git a/sqlTranslate/src/main/java/Parser/OracleParser.java b/sqlTranslate/src/main/java/Parser/OracleParser.java
index a63b2ec8c..411743f10 100644
--- a/sqlTranslate/src/main/java/Parser/OracleParser.java
+++ b/sqlTranslate/src/main/java/Parser/OracleParser.java
@@ -1076,10 +1076,56 @@ public class OracleParser {
 
             }
             else if (parseTokens.get(i).hasType(Token.TokenType.KEYWORD) && parseTokens.get(i).getValue().equalsIgnoreCase("DROP")) {
-
+                if (i + 1 < parseTokens.size() && parseTokens.get(i + 1).hasType(Token.TokenType.KEYWORD) && parseTokens.get(i + 1).getValue().equalsIgnoreCase("COLUMN")) {
+                    tokens = new ArrayList<>();
+                    tokens.add(parseTokens.get(i));
+                    for (int j = i + 1; j < parseTokens.size(); j++) {
+                        if (parseTokens.get(j).hasType(Token.TokenType.SYMBOL) && parseTokens.get(j).getValue().equalsIgnoreCase(";")) {
+                            i = j - 1;
+                            break;
+                        }
+                        tokens.add(parseTokens.get(j));
+                    }
+                    ASTNode childNode = new AlterDropColumnNode(tokens);
+                    currentNode.addChild(childNode);
+                    currentNode = childNode;
+                }
+                else if (i + 1 < parseTokens.size() && parseTokens.get(i + 1).hasType(Token.TokenType.KEYWORD) && parseTokens.get(i + 1).getValue().equalsIgnoreCase("CONSTRAINT")) {
+                    tokens = new ArrayList<>();
+                    tokens.add(parseTokens.get(i));
+                    for (int j = i + 1; j < parseTokens.size(); j++) {
+                        if (parseTokens.get(j).hasType(Token.TokenType.SYMBOL) && parseTokens.get(j).getValue().equalsIgnoreCase(";")) {
+                            i = j - 1;
+                            break;
+                        }
+                        tokens.add(parseTokens.get(j));
+                    }
+                    ASTNode childNode = new AlterDropConstraintNode(tokens);
+                    currentNode.addChild(childNode);
+                    currentNode = childNode;
+                }
+                else {
+                    try {
+                        throw new ParseFailedException("Parse failed:There exists syntex error in the input sql!");
+                    }
+                    catch (ParseFailedException e) {
+                        e.printStackTrace();
+                    }
+                }
             }
             else if (parseTokens.get(i).hasType(Token.TokenType.KEYWORD) && parseTokens.get(i).getValue().equalsIgnoreCase("MODIFY")) {
-
+                tokens = new ArrayList<>();
+                tokens.add(parseTokens.get(i));
+                for (int j = i + 1; j < parseTokens.size(); j++) {
+                    if (parseTokens.get(j).hasType(Token.TokenType.SYMBOL) && parseTokens.get(j).getValue().equalsIgnoreCase(";")) {
+                        i = j - 1;
+                        break;
+                    }
+                    tokens.add(parseTokens.get(j));
+                }
+                ASTNode childNode = new AlterModifyColumnNode(tokens);
+                currentNode.addChild(childNode);
+                currentNode = childNode;
             }
             else if (parseTokens.get(i).hasType(Token.TokenType.KEYWORD) && parseTokens.get(i).getValue().equalsIgnoreCase("RENAME")) {