The main purpose of this research is to explore the rank change of NBA teams. This article takes six seasons' statistics from 2004-2005 to 2009-2010 as the empirical data. In addition, this study applies Chi-square test and Markov chain approach to verify the rank mobility and convergence process. The result indicates that the rank mobility of NBA teams is lower in the short run, and reveals the equal probability for any movement in the long run.