diff --git a/src/ttf/table/post.js b/src/ttf/table/post.js
index 42e1502..042b68f 100644
--- a/src/ttf/table/post.js
+++ b/src/ttf/table/post.js
@@ -20,15 +20,16 @@ define(
         var Posthead = table.create(
             'posthead', 
             [
+                ['format', struct.Fixed],
                 ['italicAngle', struct.Fixed],
                 ['underlinePosition', struct.Int16],
                 ['underlineThickness', struct.Int16],
-                ['postoints', struct.Int16], // 不知道干嘛用，文档里面没有
                 ['isFixedPitch', struct.Uint32],
                 ['minMemType42', struct.Uint32],
                 ['maxMemType42', struct.Uint32],
                 ['minMemType1', struct.Uint32],
-                ['maxMemType1', struct.Uint32]
+                ['maxMemType1', struct.Uint32],
+                ['numberOfGlyphs', struct.Uint16]
             ]
         );
 
@@ -45,7 +46,7 @@ define(
                     if(format == 2) {
 
                         // 读取表头
-                        tbl = new Posthead(reader.offset).read(reader, ttf);
+                        tbl = new Posthead(this.offset).read(reader, ttf);
                         tbl.format = format;
 
                         var numberOfGlyphs = ttf.maxp.numGlyphs;
@@ -80,12 +81,12 @@ define(
                     writer.writeFixed(post.italicAngle || 0); // italicAngle
                     writer.writeInt16(post.underlinePosition || 0); // underlinePosition
                     writer.writeInt16(post.underlineThickness || 0); // underlineThickness
-                    writer.writeUint16(post.postoints || 0); // postoints
                     writer.writeUint32(post.isFixedPitch || 0); // isFixedPitch
                     writer.writeUint32(post.minMemType42 || 0); // minMemType42
                     writer.writeUint32(post.maxMemType42 || 0); // maxMemType42
                     writer.writeUint32(post.minMemType1 || 0); // minMemType1
-                    writer.writeUint32(post.maxMemType1 || numberOfGlyphs); // maxMemType1
+                    writer.writeUint32(post.maxMemType1 || 0); // maxMemType1
+                    writer.writeUint16(numberOfGlyphs); // numberOfGlyphs
 
                     // write glyphNameIndex
                     var nameIndexs = ttf.support.post.nameIndexs;