With the substantial investment from government and enterprises, the community information system is playing a more and more important role in citizens’ life. It is therefore important to measure the usage intention of CIS system from the different perspectives. By using theory of planned behavior, this paper wants to derive useful variables to address the problem of the low usage intention of CIS by citizens. The primary purpose of this study was to examine beliefs contributing to the public’s intention behavior to use community information system in their daily life. The secondary purpose was to investigate the efficacy of the decomposition of planned behavior model for such behaviors.