The Taiwan Series (Chinese: 台灣大賽) is the final championship series of the Chinese Professional Baseball League (CPBL). It is usually played in late October or early November, after the regular season. It was formerly known as the CPBL Seasonal Championship Series (Chinese: 中華職棒年度總冠軍賽), and was renamed the Taiwan Series after the merger of the CPBL and the Taiwan Major League in 2003.
Teams play two 60-game half-seasons. The two half-season winners automatically become the number one and two seeds. The winner with the better full-season record gains an automatic berth into the best-of-seven Taiwan Series, which is played in a 2-2-3 format. The other half-season winner must play a best-of-five series against the team with the best full-season record that did not win either half-season. If the same team wins both halves, the next two teams with the best full-season records play in the first round. The winner of that round advances to the Taiwan Series. In this scenario, the Taiwan Series uses a 2-2-2 format because the team that won both halves starts with an automatic one-win advantage.
Before 2000, if a team managed to win both half-seasons, they were directly crowned champion, and the Taiwan Series was not held.