Danjiangkou reservoir is the water source engineering of the Middle Line Project of Transferring Water from the South to the North. There are 53.2 per cent of the total migrants in Nanyang city. On the basis of general analysis of the environmental capacity of migrant in Nanyang city, the planning districts of migrant resettlement are determined, and its environmental capacity is calculated. Some proposals broadening the environmental capacity of migration are made. The planning districts of migrant resettlement are Dengzhou city, Tanghe county and Sheqi county. These districts can accommodate 73197 people. About seventy thousands people should be settled in other regions.