Chengdu City government implemented Comprehensive Social Insurance System since 2004 for the migrant workers，although this system rapidly spread in society by its low premium，there were problems such as low benefit，difficult transfer，high cost，complexity and so on. In 2011，Chengdu City began to reform by incorporating comprehensive insurance of migrant workers into social security of urban residents，aiming to set up urban and rural integrated social security system to realize the same premium enjoyed by the urban and rural residents. Chengdu City’s incorporating comprehensive insurance into social security is of active significance to perfecting social security system and to reference to other areas，but there are still some problems such as premium raising to cause the decline of insurance participants and unreasonable insurance fee payment and so on in the implementation of the policy，in order to realize reform objective for raising social security covering scope，this paper suggests that the method such as reducing insurance fee base and extending insurance fee payment time for previous comprehensive insurance participants should be carried out.