Abstract: As a new type of spatial planning to carry out territorial space governance in the new era, territorial spatial planning requires innovation and application of basic theories and technologies when carrying out planning environmental impact assessment (EIA). On the basis of the existing planning EIA theories and methods, we optimized and supplemented the assessment theory of resources and environment carrying capacity and the spatial relation theory of territorial spatial planning, and clarified the necessity of carrying out EIA of territorial spatial planning. The technical framework of EIA for territorial spatial planning was proposed, and the "pressure-state-response" model was innovatively applied in constructing the index system of EIA for territorial spatial planning, which was used to link the territorial spatial planning system with the ecological environment source prevention and control system. The spatial adaptability evaluation method was established on different spatial scales to solve the conflict between spatial units and ecological environment control zones. The main path for connecting the management system of ecological environment source prevention and control, tracking and monitoring, and law enforcement supervision to the whole process of territorial spatial planning, implementation and evaluation was provided. Based on the case study of some cities and counties in Hainan Province, we expounded the application characteristics of the technical framework of territorial spatial planning EIA in the territorial spatial planning EIA process of different types of cities. It was emphasized that the establishment of the working mechanism of inter-departmental interaction and standardized evaluation techniques were the important basis for a good territorial spatial planning EIA.