中国驰名商标的正确英文说法是chinese famous trademark还是chinese famous brand ,

我认为应该是chinese famous trademark
而chinese famous brand是中国名牌的意思

你给的两个选项中，chinese famous brand是较正确的表达；例句如下：

The company products are awarded" the nation quality follow-up key protection products" and" the Chinese famous brand" etc.
公司产品被授予“全国质量跟踪重点保护产品”、中国著名品牌”、全国质量检验稳定合格产品”。

中国驰名商标，地道的表达，应该是Chinese Well-known Trademark， 例句如下：

Postscript: In addition to the above relevant products, we will also paste respectively special symbols on every product who has won Chinese Well-known Trademark, China Top Brand Product, Guangdong Well-known Trademark, and Guangdong Top Brand Product.
备注：除上述相关产品外，届时将对每个获得“中国驰名商标”、中国名牌产品”、广东省驰名商标”、广东省名牌产品”的产品都加贴专门的标志。

chinese famous brand！
但是
中国名牌 CHINA TOP BRAND http://www.chinamp.org/antilabel/tedian.php
中显示：
驰名商标 well-known mark 来自《保护工业产权巴黎公约》中的英文，现在我国官方翻译已经确定为驰