Combining theories with practices, the article analyzes the operation mechanism and success reason of the micro-credit project aiming at the laid-off women by the Tianjin Women' Union.The authors think that the project realized the "Pareto Betterment" in the aspect of pushing resource allocation.The key to success is the urban environmental condition in the course of promoting this project.The article explains the significance of micro-credit on enhancing the fund efficiency, bringing up laid-off women' consciousness of independence, self-respect and confidence, pushing the construction of new municipal cooperative mechanism, and improving women' all-around ability.