While the construction of law-based government in China rule of has made great achievements，there is still a problem of lack of governmental credit，and an important reason for the lack of governmental credit in China is that the legal system of governmental credit is not perfect. Therefore，it is necessary to strengthen the construction of the governmental credit legal system and regulate the government’s dishonesty through legal means. This report analyzes the status quo of China’s governmental credit legal system from the aspects of administration by law，principle of trust protection，disclosure of government information，etc.. It also points out that China’s current governmental credit legal system has problems such as the imperfect governmental credit legal system，the unclear boundaries of administrative powers，and the unclear legal expression of governmental credit. By drawing on the advanced experience of the construction of the credit law system of foreign countries in the Anglo-American legal system countries and civil law countries，combined with China’s specific national conditions，it puts forward suggestions on perfecting the governmental credit legal system. This report advocates that China should improve the governmental credit legal system by promoting administrative procedures legislation，improving administrative open legislation，improving administrative power legislation，improving government disciplinary punishment system，establishing governmental credit evaluation mechanism，improving the civil service system，and strengthening governmental credit supervision.