diff --git a/CHANGELOG.md b/CHANGELOG.md
index 18ab1013..d1385832 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@
 - LSP 的 textDocument/publishDiagnostics 添加了 DiagnosticTag 的支持；
 - 添加 core.Ranger 接口的定义；
 - 添加了对 textDocument/references 的支持；
+- 添加了对 textDocument/definition 的支持；
 
 ## [v7.1.0]
 
diff --git a/internal/ast/sanitize.go b/internal/ast/sanitize.go
index ca36f475..13780d98 100644
--- a/internal/ast/sanitize.go
+++ b/internal/ast/sanitize.go
@@ -329,6 +329,11 @@ func (api *API) sanitizeTags() error {
 		panic("api.doc 未获取正确的值")
 	}
 
+	apiURI := api.URI
+	if apiURI == "" {
+		apiURI = api.doc.URI
+	}
+
 	for _, tag := range api.Tags {
 		t := api.doc.findTag(tag.Content.Value)
 		if t == nil {
@@ -351,7 +356,7 @@ func (api *API) sanitizeTags() error {
 		t.references = append(t.references, &Reference{
 			Location: core.Location{
 				Range: tag.R(),
-				URI:   api.URI,
+				URI:   apiURI,
 			},
 			Target: tag,
 		})
@@ -379,7 +384,7 @@ func (api *API) sanitizeTags() error {
 		s.references = append(s.references, &Reference{
 			Location: core.Location{
 				Range: srv.R(),
-				URI:   api.URI,
+				URI:   apiURI,
 			},
 			Target: srv,
 		})
diff --git a/internal/lsp/initialize.go b/internal/lsp/initialize.go
index b08e9ce4..e7604043 100644
--- a/internal/lsp/initialize.go
+++ b/internal/lsp/initialize.go
@@ -53,6 +53,10 @@ func (s *server) initialize(notify bool, in *protocol.InitializeParams, out *pro
 		out.Capabilities.ReferencesProvider = true
 	}
 
+	if in.Capabilities.TextDocument.Definition != nil {
+		out.Capabilities.DefinitionProvider = true
+	}
+
 	if in.Capabilities.TextDocument.SemanticTokens != nil {
 		out.Capabilities.SemanticTokensProvider = &protocol.SemanticTokensOptions{
 			Legend: protocol.SemanticTokensLegend{
diff --git a/internal/lsp/lsp.go b/internal/lsp/lsp.go
index da2d6bef..a77fafa1 100644
--- a/internal/lsp/lsp.go
+++ b/internal/lsp/lsp.go
@@ -106,6 +106,7 @@ func serve(t jsonrpc.Transport, infolog, errlog *log.Logger) error {
 		"textDocument/completion":     srv.textDocumentCompletion,
 		"textDocument/semanticTokens": srv.textDocumentSemanticTokens,
 		"textDocument/references":     srv.textDocumentReferences,
+		"textDocument/definition":     srv.textDocumentDefinition,
 	})
 
 	jsonrpcServer.RegisterMatcher(func(method string) bool {
diff --git a/internal/lsp/protocol/hover.go b/internal/lsp/protocol/hover.go
index bedc4a57..7d762f99 100644
--- a/internal/lsp/protocol/hover.go
+++ b/internal/lsp/protocol/hover.go
@@ -27,7 +27,6 @@ type HoverParams struct {
 // Hover textDocument/hover 的返回结果
 type Hover struct {
 	// The hover's content
-	// contents MarkedString | MarkedString[] | MarkupContent;
 	Contents MarkupContent `json:"contents"`
 
 	// An optional range is a range inside a text document
diff --git a/internal/lsp/protocol/reference.go b/internal/lsp/protocol/reference.go
index c412efe0..a2130d8f 100644
--- a/internal/lsp/protocol/reference.go
+++ b/internal/lsp/protocol/reference.go
@@ -2,7 +2,7 @@
 
 package protocol
 
-// ReferenceClientCapabilities 客户端对与 textDocument/references 的支持情况
+// ReferenceClientCapabilities 客户端对 textDocument/references 的支持情况
 type ReferenceClientCapabilities struct {
 	// Whether references supports dynamic registration.
 	DynamicRegistration bool `json:"dynamicRegistration,omitempty"`
@@ -18,3 +18,21 @@ type ReferenceParams struct {
 		IncludeDeclaration bool `json:"includeDeclaration"`
 	} `json:"context"`
 }
+
+// DefinitionClientCapabilities 客户端对 textDocument/definition 的支持情况
+type DefinitionClientCapabilities struct {
+	// Whether definition supports dynamic registration.
+	DynamicRegistration bool `json:"dynamicRegistration,omitempty"`
+
+	// The client supports additional metadata in the form of definition links.
+	//
+	// @since 3.14.0
+	LinkSupport bool `json:"linkSupport,omitempty"`
+}
+
+// DefinitionParams textDocument/definition 服务的客户端请求参数
+type DefinitionParams struct {
+	TextDocumentPositionParams
+	WorkDoneProgressParams
+	PartialResultParams
+}
diff --git a/internal/lsp/protocol/server.go b/internal/lsp/protocol/server.go
index ad3b63e6..1af902bc 100644
--- a/internal/lsp/protocol/server.go
+++ b/internal/lsp/protocol/server.go
@@ -15,18 +15,12 @@ type ServerCapabilities struct {
 	CompletionProvider *CompletionOptions `json:"completionProvider,omitempty"`
 
 	// The server provides hover support.
-	//
-	// boolean | HoverOptions
 	HoverProvider bool `json:"hoverProvider,omitempty"`
 
 	// The server provides goto definition support.
-	//
-	// boolean | DefinitionOptions;
 	DefinitionProvider bool `json:"definitionProvider,omitempty"`
 
 	// The server provides find references support.
-	//
-	// boolean | ReferenceOptions;
 	ReferencesProvider bool `json:"referencesProvider,omitempty"`
 
 	// The server provides code actions. The `CodeActionOptions` return type is only
@@ -51,8 +45,6 @@ type ServerCapabilities struct {
 	// The server provides folding provider support.
 	//
 	// Since 3.10.0
-	//
-	// boolean | FoldingRangeOptions | FoldingRangeRegistrationOptions;
 	FoldingRangeProvider bool `json:"foldingRangeProvider,omitempty"`
 
 	// The server provides folding provider support.
diff --git a/internal/lsp/protocol/textdocument.go b/internal/lsp/protocol/textdocument.go
index 3f175469..0fadc814 100644
--- a/internal/lsp/protocol/textdocument.go
+++ b/internal/lsp/protocol/textdocument.go
@@ -72,13 +72,7 @@ type TextDocumentClientCapabilities struct {
 	// Capabilities specific to the `textDocument/definition`.
 	//
 	// Since 3.14.0
-	Definition *struct {
-		// Whether definition supports dynamic registration.
-		DynamicRegistration bool `json:"dynamicRegistration,omitempty"`
-
-		// The client supports additional metadata in the form of definition links.
-		LinkSupport bool `json:"linkSupport,omitempty"`
-	} `json:"definition,omitempty"`
+	Definition *DefinitionClientCapabilities `json:"definition,omitempty"`
 
 	// Capabilities specific to the `textDocument/codeAction`
 	CodeAction *struct {
diff --git a/internal/lsp/search/reference.go b/internal/lsp/search/reference.go
index fb53221e..223e189f 100644
--- a/internal/lsp/search/reference.go
+++ b/internal/lsp/search/reference.go
@@ -35,3 +35,13 @@ func References(doc *ast.APIDoc, uri core.URI, pos core.Position, include bool)
 
 	return
 }
+
+// Definition 返回所在位置的定义内容
+func Definition(doc *ast.APIDoc, uri core.URI, pos core.Position) core.Location {
+	r := doc.Search(uri, pos, definitionerType)
+	if r == nil {
+		return core.Location{}
+	}
+
+	return r.(ast.Definitioner).Definition().Location
+}
diff --git a/internal/lsp/textdocument.go b/internal/lsp/textdocument.go
index dde4df1e..c4811318 100644
--- a/internal/lsp/textdocument.go
+++ b/internal/lsp/textdocument.go
@@ -149,3 +149,21 @@ func (s *server) textDocumentReferences(notify bool, in *protocol.ReferenceParam
 	*out = search.References(f.doc, in.TextDocument.URI, in.Position, in.Context.IncludeDeclaration)
 	return nil
 }
+
+// textDocumentDefinition
+//
+// https://microsoft.github.io/language-server-protocol/specifications/specification-current/#textDocument_definition
+func (s *server) textDocumentDefinition(notify bool, in *protocol.DefinitionParams, out *core.Location) error {
+	f := s.findFolder(in.TextDocument.URI)
+	if f == nil {
+		return newError(ErrInvalidRequest, locale.ErrFileNotFound, in.TextDocument.URI)
+	}
+
+	f.parsedMux.Lock()
+	defer f.parsedMux.Unlock()
+
+	if r := search.Definition(f.doc, in.TextDocument.URI, in.Position); !r.Range.IsEmpty() {
+		*out = r
+	}
+	return nil
+}