This study is aimed at analyzing social policy for unmarried single parents in Jeju Special Self- Governing Province, South Korea from 2005 to 2015 over 10 years by applying the policy analysis frame: dimensions of choice by Gilbert and Terrell(2013). The analysis result is as follows. First, the allocation dimension of who benefits has extended from selectivity of shelter-oriented service to universalism of community-based welfare services, which include not only unmarried mothers with their baby but also unmarried fathers with their baby. Second, social provisions have been enlarged and varied, ranging from simple shelter services to a multitude of services including shelter, voucher, cash, educational services, housing services and job training services etc. as shelter service changed into home-care service. Thirdly, the delivery system of social services for unmarried single parents has been changed from central governmental level through Jeju Special Provincial government to Jeju city government level. Research results found that all levels of government should reorganize and reform the service administration system for unmarried single parents, separated and specialized from family problems to meet the needs of a growing numberof single parents and various family types. Fourth, as financial resources of categorical grants from the central government to local government has been changed into block grants, financial deficit of local government can shake policy stability. That's why local communities should establish local ordinances to make all community social policy stable. Consequently, this policy analysis found that social welfare service for unmarried single parents has expanded but the financial resource limitation of local government can undermine the policy stability in the near future.