The core rule of government information disclosure system in Hong Kong is the Code on Access to Information that is not binding .However, the government information disclosure system is well implemented in Hong Kong, and most public citizens' applications for public information are fulfilled. As for the right to know, the ombudsman can provide citizens with effective relief. By analyzing the paradox, we can draw the conclusion that internal interest attraction and external system restriction are the core elements of the government information disclosure system. The lack of judicial relief should attribute to the excessive conservativeness of the court rather than the absence of the government information disclosure law. In order to improve the system of government information disclosure in mainland China, we should make full use of the government information disclosure system to enhance the government image,and improve the system of supervision and appraisal for the government information disclosure system.