Prior to the adoption of Social Insurance Law of People's Republic of China，Chinese social insurance legislation was featured with low legislation level，fragmentation，legislative content lagging behind the development of the times，as well as heavy emphasis on urban areas than rural areas. The impactof China'saccessioninto WTOon thea doptionof SocialInsurance Lawismainlyreflectedin threeareas:changes of internationaltradesituationacceleratedthelegislationprocess；changes inthelegal system of other areas af ected the social insurance legislation；relevant WTO rules promoted legislation in China's social insurance administration system. Take pension insurance as an example，the impact of China's accession to WTO on Social Insurance Law for this specifi c type of insurance could be mainly foundinthefollowingareas: promotingnational legislationfor theexpansionof pensioncoverage，helping to push forward the establishment of a multi-layered pension insurance system，promoting，to a certain extenttheinter regional.trans fer of pensionre lationship.After the promulg at ionof SocialInsuranceLaw， there is still some room for further improvement:the legal system needs further perfection，equality is to be further enhanced，Chinese national character is to be further explored and established.