diff --git a/FreeSql.Tests/FreeSql.Tests/PostgreSQL/PostgreSQLExpression/OtherTest.cs b/FreeSql.Tests/FreeSql.Tests/PostgreSQL/PostgreSQLExpression/OtherTest.cs
index a70426b1..18dc637d 100644
--- a/FreeSql.Tests/FreeSql.Tests/PostgreSQL/PostgreSQLExpression/OtherTest.cs
+++ b/FreeSql.Tests/FreeSql.Tests/PostgreSQL/PostgreSQLExpression/OtherTest.cs
@@ -175,9 +175,10 @@ namespace FreeSql.Tests.PostgreSQLExpression
         [Fact]
         public void HStore()
         {
-
             var sql1 = select.Where(a => a.testFieldHStore.ContainsKey("a")).ToList();
             var sql2 = select.Where(a => a.testFieldHStore.ContainsKey("a") == false).ToList();
+
+            var sql3 = select.Where(a => a.testFieldHStore["a"] == "xxx").ToList();
         }
 
         [Table(Name = "tb_alltype")]
diff --git a/Providers/FreeSql.Provider.KingbaseES/KingbaseESExpression.cs b/Providers/FreeSql.Provider.KingbaseES/KingbaseESExpression.cs
index 1c174d31..1514da29 100644
--- a/Providers/FreeSql.Provider.KingbaseES/KingbaseESExpression.cs
+++ b/Providers/FreeSql.Provider.KingbaseES/KingbaseESExpression.cs
@@ -118,11 +118,12 @@ namespace FreeSql.KingbaseES
                     if (objType != null || objType.IsArrayOrList())
                     {
                         string left = null;
-                        if (objType.FullName == typeof(Dictionary<string, string>).FullName)
+                        if (objType == typeof(Dictionary<string, string>))
                         {
                             left = objExp == null ? null : getExp(objExp);
                             switch (callExp.Method.Name)
                             {
+                                case "get_Item": return $"{left}->{getExp(callExp.Arguments[argIndex])}";
                                 case "Contains":
                                     var right = getExp(callExp.Arguments[argIndex]);
                                     return $"({left} @> ({right}))";
diff --git a/Providers/FreeSql.Provider.Odbc/KingbaseES/OdbcKingbaseESExpression.cs b/Providers/FreeSql.Provider.Odbc/KingbaseES/OdbcKingbaseESExpression.cs
index c9299d53..47adfaba 100644
--- a/Providers/FreeSql.Provider.Odbc/KingbaseES/OdbcKingbaseESExpression.cs
+++ b/Providers/FreeSql.Provider.Odbc/KingbaseES/OdbcKingbaseESExpression.cs
@@ -118,11 +118,12 @@ namespace FreeSql.Odbc.KingbaseES
                     if (objType != null || objType.IsArrayOrList())
                     {
                         string left = null;
-                        if (objType.FullName == typeof(Dictionary<string, string>).FullName)
+                        if (objType == typeof(Dictionary<string, string>))
                         {
                             left = objExp == null ? null : getExp(objExp);
                             switch (callExp.Method.Name)
                             {
+                                case "get_Item": return $"{left}->{getExp(callExp.Arguments[argIndex])}";
                                 case "Contains":
                                     var right = getExp(callExp.Arguments[argIndex]);
                                     return $"({left} @> ({right}))";
diff --git a/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLExpression.cs b/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLExpression.cs
index fb932479..be0a6e73 100644
--- a/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLExpression.cs
+++ b/Providers/FreeSql.Provider.Odbc/PostgreSQL/OdbcPostgreSQLExpression.cs
@@ -118,11 +118,12 @@ namespace FreeSql.Odbc.PostgreSQL
                     if (objType != null || objType.IsArrayOrList())
                     {
                         string left = null;
-                        if (objType.FullName == typeof(Dictionary<string, string>).FullName)
+                        if (objType == typeof(Dictionary<string, string>))
                         {
                             left = objExp == null ? null : getExp(objExp);
                             switch (callExp.Method.Name)
                             {
+                                case "get_Item": return $"{left}->{getExp(callExp.Arguments[argIndex])}";
                                 case "Contains":
                                     var right = getExp(callExp.Arguments[argIndex]);
                                     return $"({left} @> ({right}))";
@@ -206,7 +207,7 @@ namespace FreeSql.Odbc.PostgreSQL
                                 }
                                 break;
                         }
-                        if (memParentExp.FullName == typeof(Dictionary<string, string>).FullName)
+                        if (memParentExp == typeof(Dictionary<string, string>))
                         {
                             var left = getExp(memExp.Expression);
                             switch (memExp.Member.Name)
diff --git a/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLExpression.cs b/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLExpression.cs
index d2524cb4..d536881e 100644
--- a/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLExpression.cs
+++ b/Providers/FreeSql.Provider.PostgreSQL/PostgreSQLExpression.cs
@@ -149,11 +149,12 @@ namespace FreeSql.PostgreSQL
                                 }
                                 break;
                         }
-                        if (objType.FullName == typeof(Dictionary<string, string>).FullName)
+                        if (objType == typeof(Dictionary<string, string>))
                         {
                             left = objExp == null ? null : getExp(objExp);
                             switch (callExp.Method.Name)
                             {
+                                case "get_Item": return $"{left}->{getExp(callExp.Arguments[argIndex])}";
                                 case "Contains":
                                     var right = getExp(callExp.Arguments[argIndex]);
                                     return $"({left} @> ({right}))";
@@ -237,7 +238,7 @@ namespace FreeSql.PostgreSQL
                                 }
                                 break;
                         }
-                        if (memParentExp.FullName == typeof(Dictionary<string, string>).FullName)
+                        if (memParentExp == typeof(Dictionary<string, string>))
                         {
                             var left = getExp(memExp.Expression);
                             switch (memExp.Member.Name)