In August (2015), ASE publicly took over SPIL’s stock, while SPIL reversed a hostile takeover strategy in response. First SPIL adopt convertible strategies with Hon Hai as a business alliance partner. Unfortunately, because extraordinary SPIL companies didn’t pass the convertible strategy, alliance policy failed. Then again SPIL applied a private placement by planning to introduce China Tsinghua Unisplendour Group to become the largest shareholder of the company, but such a private policy is bound to face the government’s rigorous censorship. IN the meanwhile, ASE operated a second time a public takeover of SPIL’s stock. By doing so, ASE try to control one hundred percent stake in SPIL final. SPIL’s anti-hostile takeover strategy seems to be no way. In foreign law norms, taking American’s anti-hostile takeover law is more comprehensive, but Taiwan’s anti hostile acquisition strategy lacks proper law. Based on a comparison of the Law of Taiwan and the United States, this article tried to study the appropriate anti-hostile takeover strategy legality. We hope to find out a feasible solution project.