diff --git a/core/src/main/java/com/github/drinkjava2/jdialects/DDLCreateUtils.java b/core/src/main/java/com/github/drinkjava2/jdialects/DDLCreateUtils.java
index 33776cf13d01d01b3110c6f39eb2ec7d0514d654..b6b66fcc2e2ca5b7329cca10d88fb090455da71e 100644
--- a/core/src/main/java/com/github/drinkjava2/jdialects/DDLCreateUtils.java
+++ b/core/src/main/java/com/github/drinkjava2/jdialects/DDLCreateUtils.java
@@ -45,7 +45,7 @@ public class DDLCreateUtils {// NOSONAR
      */
     public static String[] toAddColumnDDL(Dialect dialect, ColumnModel... columnModels) {
         DDLFeatures f = dialect.getDdlFeatures();
-        List<String> result = new ArrayList<>();
+        List<Object> result = new ArrayList<>();
         for (ColumnModel c : columnModels) {
             DialectException.assureNotNull(c.getTableModel(), "columnModel's tableModel can not be null");
             String tableName=c.getTableModel().getTableName();
@@ -53,8 +53,10 @@ public class DDLCreateUtils {// NOSONAR
             StringBuilder sb = new StringBuilder();
             sb.append("alter table ").append(tableName).append(" ");//
             sb.append(f.addColumnString).append(" "); 
-            appendColumnDDLinBuf(dialect, sb, tableName, c);;
+            appendColumnDDLinBuf(dialect, sb, tableName, c);
             result.add(sb.toString());
+            //对于 没有单独声明DdlFeatures.columnComment 的数据库需要构建独立的 columnComment语句
+            buildColumnComment(result, tableName, c,dialect.getDdlFeatures());
         }
         return result.toArray(new String[result.size()]);
     }
@@ -236,10 +238,7 @@ public class DDLCreateUtils {// NOSONAR
 
 		// column comment on
 		for (ColumnModel c : columns) {
-			if (!c.getTransientable() && features.supportsCommentOn && c.getComment() != null
-					&& StrUtils.isEmpty(features.columnComment))
-				objectResultList.add(
-						"comment on column " + tableName + '.' + c.getColumnName() + " is '" + c.getComment() + "'");
+			buildColumnComment(objectResultList, tableName, c, features);
 		}
 
 		// index
@@ -248,6 +247,20 @@ public class DDLCreateUtils {// NOSONAR
 		// unique
 		buildUniqueDLL(dialect, objectResultList, t);
 	}
+	
+	/**
+	 * 
+	 * 独立字段描述声明语句
+	 * @param result
+	 * @param c
+	 */
+	protected static void buildColumnComment(List<Object> result,String tableName,ColumnModel c,DDLFeatures features) {
+		if (!c.getTransientable() && features.supportsCommentOn && c.getComment() != null
+				&& StrUtils.isEmpty(features.columnComment))
+			result.add(
+					"comment on column " + tableName + '.' + c.getColumnName() + " is '" + c.getComment() + "'");
+		
+	}
 
     private static void appendColumnDDLinBuf(Dialect dialect,  StringBuilder buf, String tableName, ColumnModel c) {
         DDLFeatures features=dialect.getDdlFeatures();
diff --git a/core/src/main/java/com/github/drinkjava2/jdialects/DDLFeatures.java b/core/src/main/java/com/github/drinkjava2/jdialects/DDLFeatures.java
index 857c12c56b4ffda991be7d6ce1f2ac04f0aa273a..afbdf6fca0deb877a04543b7ad4d3ad9c937f554 100644
--- a/core/src/main/java/com/github/drinkjava2/jdialects/DDLFeatures.java
+++ b/core/src/main/java/com/github/drinkjava2/jdialects/DDLFeatures.java
@@ -849,9 +849,9 @@ public class DDLFeatures {
         }
             break;
         case MySQLDialect: {
-	    	ddl.addColumnString = "add";
+	    	ddl.addColumnString = "add column";
 	        ddl.addColumnSuffixString = "";
-	        ddl.dropColumnString = NOT_SUPPORT;
+	        ddl.dropColumnString = "drop column";
 	        ddl.columnSuffixString = NOT_SUPPORT;
 	        ddl.modifyColumnString = NOT_SUPPORT;
             ddl.addFKeyRefPkeyString = " add constraint _FKEYNAME foreign key (_FK1, _FK2) references _REFTABLE (_REF1, _REF2)";
@@ -883,6 +883,7 @@ public class DDLFeatures {
             break;
         case MySQL5Dialect: {
             ddl.addColumnString = "add column";
+            ddl.dropColumnString = "drop column";
             ddl.addFKeyRefPkeyString = " add constraint _FKEYNAME foreign key (_FK1, _FK2) references _REFTABLE (_REF1, _REF2)";
             ddl.closeQuote = "`";
             ddl.columnComment = " comment '_COMMENT'";
@@ -914,7 +915,7 @@ public class DDLFeatures {
         case MySQL55Dialect: {
             ddl.addColumnString = "add column";
 	        ddl.addColumnSuffixString = "";
-	        ddl.dropColumnString = "alter table";
+	        ddl.dropColumnString = "drop column";
 	        ddl.columnSuffixString = NOT_SUPPORT;
 	        ddl.modifyColumnString = NOT_SUPPORT;
             ddl.addFKeyRefPkeyString = " add constraint _FKEYNAME foreign key (_FK1, _FK2) references _REFTABLE (_REF1, _REF2)";
@@ -948,6 +949,7 @@ public class DDLFeatures {
             break;
         case MySQL57Dialect: {
             ddl.addColumnString = "add column";
+            ddl.dropColumnString = "drop column";
             ddl.addFKeyRefPkeyString = " add constraint _FKEYNAME foreign key (_FK1, _FK2) references _REFTABLE (_REF1, _REF2)";
             ddl.closeQuote = "`";
             ddl.columnComment = " comment '_COMMENT'";
@@ -979,6 +981,7 @@ public class DDLFeatures {
             break;
         case MySQL57InnoDBDialect: {
             ddl.addColumnString = "add column";
+            ddl.dropColumnString = "drop column";
             ddl.addFKeyRefPkeyString = " add constraint _FKEYNAME foreign key (_FK1, _FK2) references _REFTABLE (_REF1, _REF2)";
             ddl.closeQuote = "`";
             ddl.columnComment = " comment '_COMMENT'";
@@ -1010,6 +1013,7 @@ public class DDLFeatures {
             break;
         case MySQL5InnoDBDialect: {
             ddl.addColumnString = "add column";
+            ddl.dropColumnString = "drop column";
             ddl.addFKeyRefPkeyString = " add constraint _FKEYNAME foreign key (_FK1, _FK2) references _REFTABLE (_REF1, _REF2)";
             ddl.closeQuote = "`";
             ddl.columnComment = " comment '_COMMENT'";
@@ -1041,6 +1045,7 @@ public class DDLFeatures {
             break;
         case MySQLInnoDBDialect: {
             ddl.addColumnString = "add column";
+            ddl.dropColumnString = "drop column";
             ddl.addFKeyRefPkeyString = " add constraint _FKEYNAME foreign key (_FK1, _FK2) references _REFTABLE (_REF1, _REF2)";
             ddl.closeQuote = "`";
             ddl.columnComment = " comment '_COMMENT'";
@@ -1071,6 +1076,7 @@ public class DDLFeatures {
             break;
         case MySQLMyISAMDialect: {
             ddl.addColumnString = "add column";
+            ddl.dropColumnString = "drop column";
             ddl.addFKeyRefPkeyString = " add constraint _FKEYNAME foreign key (_FK1, _FK2) references _REFTABLE (_REF1, _REF2)";
             ddl.closeQuote = "`";
             ddl.columnComment = " comment '_COMMENT'";
@@ -1100,6 +1106,7 @@ public class DDLFeatures {
             break;
         case MySQL8Dialect: {
             ddl.addColumnString = "add column";
+            ddl.dropColumnString = "drop column";
             ddl.addFKeyRefPkeyString = " add constraint _FKEYNAME foreign key (_FK1, _FK2) references _REFTABLE (_REF1, _REF2)";
             ddl.closeQuote = "`";
             ddl.columnComment = " comment '_COMMENT'";