This article research Sixteenth Congress and Seventeenth Congress of Chinese Communist Party in view of contrast, that mainly base on the incentive and attempt of theoried the study in Mainland China and Cross-strait relation. Besides, the analysising of Sixteenth Congress and Seventeenth Congress, this article is to the direction of grand theory as realism, liberalism and constructivism to explain and understand the meaning of that to Taiwan in addition of the normative suggestion for it. The Chinese Communist Party flexible practice the implication of realism, liberalism and constructivism to shape policy toward Taiwan. Maybe only the Lockean Culture and Kantean Culture of constructivism's context could bring peace and welfare to Cross-strait. However, Taiwan seem to still leave some Cold-War thoughts as not to break the stalemate in Both-side and solve the potential conflict of Taiwanese Strait.