diff --git a/go.mod b/go.mod
index db2b0b6..db1680c 100644
--- a/go.mod
+++ b/go.mod
@@ -10,7 +10,7 @@ require (
 	github.com/tdewolff/font v0.0.0-20260913163313-54f98bb59ee6
 	github.com/xiaoqidun/j2kgo v0.0.0-20261009063910-4865a21ef893
 	github.com/xiaoqidun/jbig2 v1.1.4
-	github.com/xiaoqidun/pdfgo v0.0.0-20261010042215-c8c66c83f031
+	github.com/xiaoqidun/pdfgo v0.0.0-20261010050917-6c0a77a9f79a
 	golang.org/x/crypto v0.58.0
 	golang.org/x/image v0.47.0
 	golang.org/x/text v0.43.0
diff --git a/go.sum b/go.sum
index 3292087..1179e7f 100644
--- a/go.sum
+++ b/go.sum
@@ -62,8 +62,8 @@ github.com/xiaoqidun/j2kgo v0.0.0-20261009063910-4865a21ef893 h1:jmQlBO7R+bcimOM
 github.com/xiaoqidun/j2kgo v0.0.0-20261009063910-4865a21ef893/go.mod h1:DCwAfuDzCDYqUiAlZ7BDwigTjaXw7o9L1FtEma/D1aA=
 github.com/xiaoqidun/jbig2 v1.1.4 h1:LF6J1si4JY+TszTh9+m4KAg9/ba0JjfXoGtQTQC2S8c=
 github.com/xiaoqidun/jbig2 v1.1.4/go.mod h1:9jromqVwMqlptUDEt6Yip8vqYA5I1YjhG7FgMl/Z2dA=
-github.com/xiaoqidun/pdfgo v0.0.0-20261010042215-c8c66c83f031 h1:FV9MPGAQ08+AGYMPKesJWl42eLL5TPU+4niOlY1sVTY=
-github.com/xiaoqidun/pdfgo v0.0.0-20261010042215-c8c66c83f031/go.mod h1:fXz1emtF1YCpcIv+fglDZstjkHxjS2l3G4DVMgUzVnk=
+github.com/xiaoqidun/pdfgo v0.0.0-20261010050917-6c0a77a9f79a h1:6zWvNSCI6VSW7DIwFtlfrUe8r57dtrykyO9ShXMOssI=
+github.com/xiaoqidun/pdfgo v0.0.0-20261010050917-6c0a77a9f79a/go.mod h1:fXz1emtF1YCpcIv+fglDZstjkHxjS2l3G4DVMgUzVnk=
 github.com/xyproto/randomstring v1.0.5 h1:YtlWPoRdgMu3NZtP45drfy1GKoojuR7hmRcnhZqKjWU=
 github.com/xyproto/randomstring v1.0.5/go.mod h1:rgmS5DeNXLivK7YprL0pY+lTuhNQW3iGxZ18UQApw/E=
 github.com/yuin/goldmark v1.8.5 h1:r6N5afV5qj/5S4UTch8agZHJ8UxNCMwX7WjkkJam2NA=
diff --git a/ofdgo_editor_composite_text.go b/ofdgo_editor_composite_text.go
index 03a750f..80f9d0d 100644
--- a/ofdgo_editor_composite_text.go
+++ b/ofdgo_editor_composite_text.go
@@ -29,7 +29,7 @@ func (e *Editor) UpdateCompositeText(page int, path ObjectPath, index int, value
 }
 
 // StyleCompositeText 批量修改内部文字字体、字号或颜色，换字体保留原文字定位
-// 字体缺字或复杂字形映射使整批操作失败，不使用回退字体代替原文
+// 更换字体时同步字形索引，无法逐字映射时需显式重排，缺字使整批操作失败
 // 入参: page 页面索引, path 父复合路径, indexes 成员序号, style 文字样式增量
 // 返回: error 错误信息
 func (e *Editor) StyleCompositeText(page int, path ObjectPath, indexes []int, style TextStyle) error {
@@ -78,7 +78,13 @@ func (e *Editor) updateCompositeText(node *editorCompositeNode, member Composite
 	content, layout := text.TextLayout()
 	original := content
 	if style.Font != "" {
-		text.Font = style.Font
+		if state.layout == nil && options == nil && (style.Size == 0 || style.Size == text.Size) {
+			if err := e.replaceTextFont(&text, style.Font); err != nil {
+				return err
+			}
+		} else {
+			text.Font = style.Font
+		}
 	}
 	if value != nil {
 		content = *value
@@ -105,6 +111,7 @@ func (e *Editor) updateCompositeText(node *editorCompositeNode, member Composite
 			return err
 		}
 		object.TextObject.TextCode = text.TextCode
+		object.TextObject.CGTransform = text.CGTransform
 	} else if options != nil || content != original || style.Size != 0 && style.Size != text.Size || state.layout != nil && state.layout.options.Shape && style.Font != "" && style.Font != object.TextObject.Font {
 		if style.Size != 0 {
 			text.Size = style.Size
@@ -131,6 +138,7 @@ func (e *Editor) updateCompositeText(node *editorCompositeNode, member Composite
 			return err
 		}
 		object.TextObject.Font = style.Font
+		object.TextObject.CGTransform = text.CGTransform
 	}
 	if style.Color != "" {
 		if err := creationColor(&FillColor{Value: style.Color}); err != nil {
diff --git a/ofdgo_editor_text.go b/ofdgo_editor_text.go
index 1fc36f9..d11a859 100644
--- a/ofdgo_editor_text.go
+++ b/ofdgo_editor_text.go
@@ -361,7 +361,11 @@ func (e *Editor) styleTextObjects(objects []GraphicObject, style TextStyle) ([]G
 			return nil, &EditError{Code: EditUnsupportedObject, Err: fmt.Errorf("object %q requires explicit paragraph layout before changing size", id)}
 		}
 		if fontChanged {
-			text.Font = style.Font
+			if known {
+				text.Font = style.Font
+			} else if err := e.replaceTextFont(text, style.Font); err != nil {
+				return nil, err
+			}
 		}
 		if sizeChanged {
 			text.Size = style.Size
@@ -390,6 +394,49 @@ func (e *Editor) styleTextObjects(objects []GraphicObject, style TextStyle) ([]G
 	return updates, nil
 }
 
+// replaceTextFont 更换字体并重建字形索引，保留原文字定位
+// 入参: text 文字对象, id 目标字体标识
+// 返回: error 错误信息
+func (e *Editor) replaceTextFont(text *TextObject, id string) error {
+	if text.Font == id {
+		return nil
+	}
+	if len(text.CGTransform) == 0 {
+		text.Font = id
+		return nil
+	}
+	if err := validateTextGlyphs(*text, 1<<16); err != nil {
+		return err
+	}
+	font, err := e.editorFont(id)
+	if err != nil {
+		return err
+	}
+	var chars []rune
+	for _, code := range text.TextCode {
+		chars = append(chars, textCodeRunes(code.Value)...)
+	}
+	transforms := append([]CGTransform(nil), text.CGTransform...)
+	var missing []rune
+	for i := range transforms {
+		transform := &transforms[i]
+		if transform.CodeCount != 1 || transform.GlyphCount != 1 {
+			return &EditError{Code: EditLayoutRequired, Err: fmt.Errorf("changing the font of combined glyphs requires explicit layout")}
+		}
+		char := chars[transform.CodePosition]
+		glyph := font.GlyphIndex(char)
+		if glyph == 0 {
+			missing = append(missing, char)
+		}
+		transform.Glyphs = strconv.Itoa(int(glyph))
+	}
+	if err := missingGlyphError(id, missing); err != nil {
+		return err
+	}
+	text.Font, text.CGTransform = id, transforms
+	return nil
+}
+
 // breakTextLines 优先使用Unicode断行机会，过长词仅在字素边界折行，不丢弃空白
 // 入参: runes 段落字符, advances 含字距的字符步进, width 本地排版宽度, wrap 是否自动折行, spacing 附加字距, indent 首行缩进
 // 返回: [][2]int 各行的字符起止索引，左闭右开