Since Beijing started to purchase social service provided by social organizations in 2010，great achievements have been made in the scale，size，quality and procedure of social service purchase. Social and economic benefits have emerged ever since. Its effect is：perfected the hub social organizations network；expanded professional social organization service coverage；stimulated the social organization innovation vitality However，there still exist several problems. For example，the scale of social service purchase is yet too small to have enough planning power. Management and regulation is sufficient. Legal safeguard is incomplete. The capacity of social organization is not competitive. Thus further attention should be paid to overall planning，process optimizing and capacity enhancing to improve social service purchase.