After the ruling of Tsai government, Taiwan faces Major challenge .The author wants to know what kind of difficulties on Taiwan? This article is mainly discussing about the situation of Taiwan. The author plans to know Taiwan international and domestic environment. By discussing this topic, we can provide government authorities as a reference for governance. This article is mainly discussing about the discussion of the development over Cross-Strait Relations under Tsai government by all kinds of aspects. First, the author discusses the ruling situation about foreign affairs and cross strait relations. Second, Taiwan 's external dilemma including 1992 Consensus、One Belt, One Road、The Trans-Pacific Partnership and New Southern Policy Third, Taiwan biggest opposing party, KMT's cross strait policy needs to be discussed. Finally, the author makes a conclusion about the development of Cross-Strait Relations under Tsai government