Lewis Model and Todaro Model provide two opposite policy choices for labor force transfer in developing countries，and the reasons are as follows：Firstly，Lewis model is suitable for the early stage of economic development in developing countries，while Todaro model is suitable for the specific stage of urbanization in developing countries. Secondly，Lewis model， from the perspective of macro-economic structure transformation，analyses the process of labor transfer from agricultural sector to modern urban sector in developing countries，which is called “process theory”，while Todaro model analyses the decision-making behavior of rural labor transfer from micro-individual decision-making perspective， which is called “decision theory”. Thirdly，Lewis Model focuses on solving the problems that dual economic structure brings， while Todaro Model focuses on solving the problems of urban unemployment. The common defect of the two theoretical models is that the special national conditions and institutional factors of developing countries are not taken into account in explaining the transfer of rural labor force， especially the complexity and phases of the transfer of rural labor force in China，a large developing country. Therefore， this paper tries to modify the Todaro Model from the variables of the stage of rural labor mobility， the decision-makers and the institutional changes， and proposes the policy options for rural labor transfer in China.