During the medical assistance in policy implementation，good policy text does not necessarily lead to the target groups’ benefiting. In this study，according to case of the program “Reborn Action-National poverty family lip cleft palate children surgery rehabilitation plans” which conducted cooperatively by the Ministry of Civil Affairs of the People’s Republic of China（MCA）and Lee Ka Cheng Foundation（LKSF），we use the concept of “Welfare availability” as the theory analysis framework，from the following five aspects：the existence of the service and the welfare resources harvest or not，accesses of which the service object obtain the information ，the purpose of the policy subject and its match ，the service facilities are sufficient and can be available，policy measures and their adjustments with the current trends，analysis the factors of how the social policy effect service object’s welfare availability，try to provide some useful experiences for the implementation of similar medical assistance of social policy.