The Philippines is the first state of the southeast Asia states to carry out democratic politics, but along with the political strongman that Ferdinand Marcos declared the martial law, the democracy in Philippines turned back the wheel of history. Although Mrs. Corazon Aquino won the president election with the people''s power in 1986, she enacted a new constitution, and practice it as a democratic regime. However, the democratic regime of the Philippines had been destroyed by Ferdinand Marcos. In the past decades, stability of two-party system in the Philippines had been disappeared. After Taiwan declared to repeal the martial law in 1987, the development of party politics in Taiwan mushroomed, the transition of party-system from one dominant party system to multi-party system. It oriented toward the stable two-party system. The single-constituency two-vote system is an important trend in the reform of many democracies since the 1990s. Generally speaking, the German Mixed-Member Proportional representation and the Japanese Parallel voting are mainly represented. Since the beginning of 2008, Taiwan adopted the new election system in the seventh, eighth and ninth election of the Legislative Yuan.
On the basis of the similarity between the development of the Philippines and Taiwan''s democratization, the differences between the political parties in the post-democratization of the two countries are to be discussed in my research. This focus of this paper will concentrate on the formation of democratic system from the political environment background of the Philippines and Taiwan. As the main axis of the study, in addition to explore the single-constituency two-vote system theory, this paper will discuss the similarities and differences of the election system of both two countries, and to explore and analyze the reasons of their difference. Finally, the paper will compare the election system of the Parliamentary institution of both two countries.