China-ASEAN Free Trade Area is established in 2010. In this region, China has become the largest trading partner of ASEAN in recent years. The Taiwan enterprises protection mechanism is effective in mainland China, but there exits the necessities in South-East Asia region. This study first analyzes how China- ASEAN Free Trade Area affects the mainland China and Taiwan, and concludes with recommendation of the rule of law. Also, this paper reminds the Chinese authorities should pay attention to the rights and interests of Taiwan enterprises, and gives them suitable effective and appropriate protection in this increasingly robust region.