diff --git a/kclvm/tools/src/LSP/src/goto_def.rs b/kclvm/tools/src/LSP/src/goto_def.rs
index 2278bc133..ebbdb9f0a 100644
--- a/kclvm/tools/src/LSP/src/goto_def.rs
+++ b/kclvm/tools/src/LSP/src/goto_def.rs
@@ -14,7 +14,7 @@ use kclvm_ast::ast::{Expr, Identifier, ImportStmt, Node, Program, Stmt};
 use kclvm_compiler::pkgpath_without_prefix;
 use kclvm_error::Position as KCLPos;
 
-use kclvm_sema::builtin::get_system_member_function_ty;
+use kclvm_sema::builtin::{get_system_member_function_ty, STRING_MEMBER_FUNCTIONS};
 use kclvm_sema::resolver::scope::{
     builtin_scope, ProgramScope, Scope, ScopeObject, ScopeObjectKind,
 };
@@ -334,6 +334,29 @@ pub(crate) fn resolve_var(
                             None => None,
                         }
                     }
+                    kclvm_sema::ty::TypeKind::Str => {
+                        if names.len() == 2 {
+                            let func_name_node = node_names[1].clone();
+                            let func_name = func_name_node.node.clone();
+                            if let Some(ty) = STRING_MEMBER_FUNCTIONS.get(&func_name) {
+                                match &ty.kind {
+                                    kclvm_sema::ty::TypeKind::Function(func_ty) => {
+                                        return Some(Definition::Object(ScopeObject {
+                                            name: func_name,
+                                            start: func_name_node.get_pos(),
+                                            end: func_name_node.get_end_pos(),
+                                            ty: Rc::new(ty.clone()),
+                                            kind: ScopeObjectKind::FunctionCall,
+                                            doc: Some(func_ty.doc.clone()),
+                                        }))
+                                    }
+                                    // unreachable
+                                    _ => {}
+                                }
+                            }
+                        }
+                        None
+                    }
                     _ => None,
                 },
                 None => None,
diff --git a/kclvm/tools/src/LSP/src/hover.rs b/kclvm/tools/src/LSP/src/hover.rs
index dc6755de5..5bd8cea5a 100644
--- a/kclvm/tools/src/LSP/src/hover.rs
+++ b/kclvm/tools/src/LSP/src/hover.rs
@@ -377,4 +377,31 @@ mod tests {
             _ => unreachable!("test error"),
         }
     }
+
+    #[test]
+    #[bench_test]
+    fn str_var_func_hover() {
+        let (file, program, prog_scope, _) = compile_test_file("src/test_data/hover_test/hover.k");
+        let pos = KCLPos {
+            filename: file.clone(),
+            line: 28,
+            column: Some(12),
+        };
+        let got = hover(&program, &pos, &prog_scope).unwrap();
+        match got.contents {
+            lsp_types::HoverContents::Array(vec) => {
+                assert_eq!(vec.len(), 3);
+                if let MarkedString::String(s) = vec[0].clone() {
+                    assert_eq!(s, "str\n\n");
+                }
+                if let MarkedString::String(s) = vec[1].clone() {
+                    assert_eq!(s, "fn capitalize() -> str");
+                }
+                if let MarkedString::String(s) = vec[2].clone() {
+                    assert_eq!(s, "Return a copy of the string with its first character capitalized and the rest lowercased.");
+                }
+            }
+            _ => unreachable!("test error"),
+        }
+    }
 }
diff --git a/kclvm/tools/src/LSP/src/test_data/hover_test/hover.k b/kclvm/tools/src/LSP/src/test_data/hover_test/hover.k
index 8eeff9c47..db7a0f73d 100644
--- a/kclvm/tools/src/LSP/src/test_data/hover_test/hover.k
+++ b/kclvm/tools/src/LSP/src/test_data/hover_test/hover.k
@@ -23,3 +23,6 @@ abdc = base64.encode("1")
 abcd = "a".count()
 
 print(1)
+
+a = "".capitalize()
+b = a.capitalize()