In August, 2004, the Legislative Yuan in Taiwan passed landmark constitutional amendment proposals to cut the number of legislative seats in half, and adopt a "single-district, two-vote" system. In May, 2005, the parliamentary electorate system in Taiwan was officially changed from a single-nontransferable voting system (SNTV) to a single-member district parallel voting system. The new voting system was introduced in January, 2008. Under SNTV, the seats won in Kaohsiung County¡¥s legislator election were in proportion to the two political parties. However, the result of the first election after the electorate system changed showed a landslide victory of the KMT (Kuomingtang). The DPP (Democratic Progressive Party) should not have suffered such defeat in the election with the strength and power that their political factions have in Kaohsiung County. Many factors are for certain involved in winning or losing an election, and the focus of this thesis will be on the changes of political factions and how they can influent vote results. Under SNTV, the most influential and powerful political factions in Kaohsiung County were the Red Party, the White Party, and the Black Party. Under the new electoral system, however, as only one candidate will be elected, the political factions, as well as the candidates, have started changing their ways of thinking in terms of whom they should support. The candidates have been paying much more attention to the local political factions. Taking their own interests into consideration, the local political factions have also changed the way they intend to manipulate the vote results. The awakening of the local political factions indirectly made impacts on the result of the Seventh legislator election. In the future, the results of various elections may very well be influenced by the changes of the local political factions. To gain a clearer view of the changes of Kaohsiung County¡¥s political factions under the new voting system, the thesis will first describe the similarities and differences between SNTV and single-member district parallel voting system. It will then discuss the formation and development of Taiwan and Kaohsiung County¡¥s local political factions. The different electoral tactics of the KMT and the DPP under the two voting systems will then be analyzed, following by the examination of the voting results.