diff --git a/src/gausskernel/storage/access/cbtree/cbtree.cpp b/src/gausskernel/storage/access/cbtree/cbtree.cpp
index 08de204ab..95046681b 100644
--- a/src/gausskernel/storage/access/cbtree/cbtree.cpp
+++ b/src/gausskernel/storage/access/cbtree/cbtree.cpp
@@ -145,19 +145,34 @@ Datum cbtreecanreturn(PG_FUNCTION_ARGS)
 {
     PG_RETURN_BOOL(true);
 }
-
+/*
+function name:cbtreeoptions
+description:This function is part of handling the CBTree index.
+Note: The main process is as follows:
+STEP1:To get the default relationship options, if the `validate` parameter is true, then the `default_reloptions` function will validate the validity of the options.
+STEP2:If filledOption is null,return Datum(0),else return Datum(filledOption)
+date: 2023/9/17
+*/
 Datum cbtreeoptions(PG_FUNCTION_ARGS)
 {
     Datum indexRelOptions = PG_GETARG_DATUM(0);
     bool validate = PG_GETARG_BOOL(1);
 
-    bytea *filledOption = default_reloptions(indexRelOptions, validate, RELOPT_KIND_CBTREE);
+    bytea *filledOption = default_reloptions(indexRelOptions, validate, RELOPT_KIND_CBTREE);//To get the default relationship options, if the `validate` parameter is true, then the `default_reloptions` function will validate the validity of the options.
     if (filledOption != NULL)
         PG_RETURN_BYTEA_P(filledOption);
 
     PG_RETURN_NULL();
 }
-
+/*
+function name:cbtreegettuple
+description:This function is part of handling the CBTree index. 
+Note: The main process is as follows:
+STEP1:The function first checks whether the scan parameter is NULL. If it is, it will report an error and exit.
+STEP2:The function calls the _bt_gettuple_internal function to get the tuple.And returns a boolean value indicating whether the tuple was successfully obtained.
+STEP3:The cbtreegettuple function returns the result of the _bt_gettuple_internal function
+date: 2023/9/17
+*/
 Datum cbtreegettuple(PG_FUNCTION_ARGS)
 {
     IndexScanDesc scan = (IndexScanDesc)PG_GETARG_POINTER(0);
@@ -182,6 +197,17 @@ Datum cbtreegettuple(PG_FUNCTION_ARGS)
  * @IN param isnulls: the container to use temprarily
  * @IN param transferFuncs: the transfer functions array
  */
+/*
+function name:InsertToBtree
+description:This function is part of handling the CBTree index.
+Note: The main process is as follows:
+STEP1:It gets the number of rows in the batch and adds this to reltuples.
+STEP2:For each row in the batch, it does the following:checking if the value is null. If it is, it sets the corresponding entry in isnulls to true. Otherwise, it sets it to false and converts the scalar value to a datum using the corresponding transfer function.
+And it gets the item pointer (tid) for the row. 
+STEP3:It calls _bt_spool to add the tid and values to the B-tree spool.
+STEP4:add buildstate.indtuples.
+date: 2023/9/17
+*/
 static void InsertToBtree(VectorBatch *vecScanBatch, BTBuildState &buildstate, IndexInfo *indexInfo, double &reltuples,
                           Datum *values, bool *isnulls, ScalarToDatum *transferFuncs)
 {