National audit supervision plays a critical part in national governance system, the perfection and implementation of the legal system of audit supervision is indispensable of promoting the level of national governance effectively. At present, the initially established legal system of China’s National audit supervision still exists many shortcomings, for example, the weak independence of auditing institutions, opaque of audit results announcement, performance audit has not carried out. These weaknesses have greatly impaired the function and further development of governmental auditing. This paper elaborates the mature experience of audit supervision legislation abroad, analyzes the current situation and problems of the laws and regulations of China’s existing Governmental Audit Supervision, and proposes the measures for improvement accordingly.