This study attempts to comprehend the current development of the Third Sectors in both Taiwan and Hong Kong by focusing on the nonprofit welfare service sectors. The key variables in explanation are “the state role” and “religion attributes”. Data used in this study is from our 2005-2006 NSC research project titled “A Comparative Study on the Third Sector Landscapes in Taiwan and Hong Kong: Focusing on the Welfare Service Sectors.” The results of this study indicate that “the state role” and “religion attributes” profoundly influence the development of nonprofit welfare services in these two places, such as the organizational age, legal attributes, religious attributes, sources and amount of funds, the structure and function of full-time employees and volunteers, etc. The conclusion of this study emphasizes that changing in political regime has resulted in a significant effect on the interaction between state and NPO welfare service organizations in both Taiwan and Hong Kong. The same is the role played by religion factor, in particular, Christian and Catholic, which have deeply affected the development of welfare organizations in these two places. Moreover, religious organizations have been important partners of the public authorities in the provision of social services.