Taiwan Series (Chinese: 台灣大賽) is the championship series of the Chinese Professional Baseball League. It is usually played in October, 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 Chinese Professional Baseball League and the Taiwan Major League in 2003. Starting in 2005, the winner of the Taiwan Series competes in the Asia Series.
Teams play two fifty-game half seasons. The two half-season winners are automatically the number one and two seeds; the one with the better full-season record gains an automatic berth into the best-of-seven Taiwan Series, played in a 2-3-2 format. The other team must play a best-of-five series against the team with the best full-season record but didn't win either half-season.
If the same team wins both halves, the next two teams with the best full-season record play in the first round; the winner plays in the Taiwan Series, with the team that wins both halves having a 2-2-3 format.