diff --git a/chore/_xtool/llcppsigfetch/parse/cvt.go b/chore/_xtool/llcppsigfetch/parse/cvt.go
index b91a5a32..64ed372f 100644
--- a/chore/_xtool/llcppsigfetch/parse/cvt.go
+++ b/chore/_xtool/llcppsigfetch/parse/cvt.go
@@ -194,6 +194,8 @@ func visit(cursor, parent clang.Cursor, clientData unsafe.Pointer) clang.ChildVi
 		ct.PopScope()
 	case clang.CursorStructDecl:
 		ct.ProcessStruct(cursor)
+	case clang.CursorUnionDecl:
+		ct.ProcessUnion(cursor)
 	case clang.CursorFunctionDecl:
 		ct.curFile.Decls = append(ct.curFile.Decls, ct.ProcessFunc(cursor))
 	case clang.CursorNamespace:
@@ -435,6 +437,11 @@ func (ct *Converter) ProcessStruct(cursor clang.Cursor) {
 	ct.curFile.Decls = append(ct.curFile.Decls, structDecl)
 }
 
+func (ct *Converter) ProcessUnion(cursor clang.Cursor) {
+	structDecl := ct.ProcessStructOrClass(cursor, ast.Union)
+	ct.curFile.Decls = append(ct.curFile.Decls, structDecl)
+}
+
 func (ct *Converter) ProcessClass(cursor clang.Cursor) {
 	classDecl := ct.ProcessStructOrClass(cursor, ast.Class)
 	// other logic for class
diff --git a/chore/_xtool/llcppsigfetch/parse/cvt_test/decl_test/decl.go b/chore/_xtool/llcppsigfetch/parse/cvt_test/decl_test/decl.go
index 27cd2253..ec00ba19 100644
--- a/chore/_xtool/llcppsigfetch/parse/cvt_test/decl_test/decl.go
+++ b/chore/_xtool/llcppsigfetch/parse/cvt_test/decl_test/decl.go
@@ -10,6 +10,7 @@ func main() {
 	TestComment()
 	TestStructDecl()
 	TestClassDecl()
+	TestUnionDecl()
 	TestEnumDecl()
 }
 
@@ -100,6 +101,16 @@ func TestStructDecl() {
 	test.RunTest("TestStructDecl", testCases)
 }
 
+func TestUnionDecl() {
+	testCases := []string{
+		`union A {
+			int a;
+			int b;
+		};`,
+	}
+	test.RunTest("TestUnionDecl", testCases)
+}
+
 func TestClassDecl() {
 	testCases := []string{
 		`class A {
diff --git a/chore/_xtool/llcppsigfetch/parse/cvt_test/decl_test/llgo.expect b/chore/_xtool/llcppsigfetch/parse/cvt_test/decl_test/llgo.expect
index 893bc838..5a37e43c 100644
--- a/chore/_xtool/llcppsigfetch/parse/cvt_test/decl_test/llgo.expect
+++ b/chore/_xtool/llcppsigfetch/parse/cvt_test/decl_test/llgo.expect
@@ -1296,6 +1296,57 @@ TestClassDecl Case 2:
 	}
 }
 
+TestUnionDecl Case 1:
+{
+	"temp.h":	{
+		"path":	"temp.h",
+		"decls":	[{
+				"Loc":	{
+					"File":	"temp.h"
+				},
+				"Doc":	{
+					"List":	[]
+				},
+				"Parent":	null,
+				"Tag":	1,
+				"Fields":	{
+					"List":	[{
+							"Type":	{
+								"Kind":	6,
+								"Flags":	0
+							},
+							"Doc":	{
+								"List":	[]
+							},
+							"Comment":	{
+								"List":	[]
+							},
+							"Names":	[{
+									"Name":	"a"
+								}]
+						}, {
+							"Type":	{
+								"Kind":	6,
+								"Flags":	0
+							},
+							"Doc":	{
+								"List":	[]
+							},
+							"Comment":	{
+								"List":	[]
+							},
+							"Names":	[{
+									"Name":	"b"
+								}]
+						}]
+				},
+				"Methods":	[]
+			}],
+		"includes":	[],
+		"macros":	[]
+	}
+}
+
 TestEnumDecl Case 1:
 {
 	"temp.h":	{