The National Intelligence Service Law enacted in February 2005 is the first to regulate the operation of intelligence agencies. The content of National Intelligence Service Law is consisted of the neutrality of intelligence,th e condition for secretly gathering intelligence,the protection for intelligence agents,and intelligence integration...etc,which are regarded as a critical milestone for intelligence service institutionalization. The law has been amended for three times so far after it was enacted thus to reach great progress in the measures of service administration from the aspects of protecting the rights and interests of intelligence agents,r educing espionage activities,and promoting intelligence integration. Besides,in the amending process,We can find that it is service administrative to orient towards the phase of enlarging room for rewarding intelligence service,extendin g the scope and terms of compensation and assistance, and to grant the authorities to stipulate treatment and reward standards for field agents. Moreover,it exhibits the spirit of special criminal law in anti espionage,which includes passively excluding the application of Criminal Procedure Law in report,accessing to personal data of espionage suspects,aggr avating punishment for non militant espionage,and laying out the exemption clauses for espionage activities explicitly. However, the law related to gathering intelligence secretly,es pecially gathering the personal data of individuals,still has room to improve.