The Anti-Secession Law passed by the Chinese government is a controversial move that not only caught Taiwan's attention but concerned by the international community. This law's unilaterally claim that "Taiwan is a part of China", and the legal enforcement to use of arm forces against Taiwan will no doubt threaten the stability and peace in the region of Asia Pacific. Taiwan, being the targeted object of Anti-Secession Law, other than considering the possibility of military threat from China, should also question the legality of Chinese government's right to impose its domestic law against Taiwan. Essentially, one of the most important question of this article is to ask: does the Anti-Secession Law violate the International Law? This article aims to discuss the legal deficiency of Anti-Secession Law, in order to spotlight all the possible ways for claiming Taiwan as an independent sovereign country to the International Community. Firstly, the Anti-Secession Law, which unilaterally claims Taiwan as a part of China and forbids any person or group from advocating independence, violates International Human Rights Treaties and the universal principle of freedom of choice. Secondly, since the Kellogg-Brigand Pact in 1928 and the passage of UN Charter, the principle of non-aggression has been established. Therefore, if the Chinese Government insists on implement this law, it should be regarded as committing Crime of Aggression and War Crime. Besides, the legislative procedure of Anti-Secession shows neither respect of public opinion nor legal basis. In other words, Anti-Secession Law relies merely on the use of arm forces instead of legal standing so it should be regarded as invalid by the International Community.