For the effective design and image quality analysis of spaceborne digital TDI systems, a method for analyzing the factors affecting the entire link image quality of spaceborne digital TDI systems is proposed. The principles and influencing factors of spaceborne digital TDI technology are analyzed, an end-to-end simulation model considering all the stages including scenario, atmosphere, spaceborne system and processing algortithm of the digital TDI imaging system is constructed, and digital TDI imaging simulations and analysis evaluations under the influence of multiple factors are carried out. The results show that at a resolution of 0.9 m, with an exposure time of 0.063 ms, a quantization bit of 12 bit, and a TDI level of 6, good image quality can be obtained. The use of digital TDI technology can relieve the platform stabilty requirement to 0.1 (°)/s. This study can provide some reference for the design and analysis of spaceborne digital TDI system.