be famous for和be famous as用法区别详细解析如下：

两个短语的含义有所不同，需从含以上进行区分。

1.be famous for + 特征、特点： 因（拥有）……而闻名

可以这样辅助记忆：for含“因为、由于”的含义

Hangzhou is famous for the West Lake.

杭州以西湖闻名。

The hotel is famous for its food.

这家酒店因为它的美食而出名。

France is famous for its wine.

法国因为葡萄酒而出名。

Einstein was famous for his Theory of Relativity.

爱因斯坦因为他的相对论而出名。

2.be famous as +身份/职业等： 作为……而著名，以......（身份）而出名

可以这样辅助记忆：as含“作为”的含义

He is famous as an actor. 

他作为一位演员而出名。

Dunhuang is famous as the City of Sands.

敦煌以作为沙城而闻名。

He was famous as the inventor of the modern ballpoint pen.

他以作为现代圆珠笔的发明家而著名。 

试对比：

John is famous as a singer.

约翰以作为歌手而出名。

John is famous for his voice.

约翰因为他的嗓音而出名。

The castle is famous for its history.

这座城堡因为它的历史而出名。

The castle is famous as the place where many weddings are held.

这座城堡因为作为众多婚礼的举行地而闻名。

以上就是be famous for和be famous as的用法区别，希望对你有所帮助。