In order to solve the problem of engineering verification and evaluation of large radar system, a simulation system of radar integrated test bed is designed. In view of the diverse radar working mode and characteristics of large complex electromagnetic environment, the use of digital simulation technology, the design of radar detection space target and interference of the sparse distribution, radar environment in radar detection space distribution or distribution environment and radar echo modeling, constructs a set of comprehensive test platform of radar simulation system. The test results show that the simulation system of radar integrated test design using digital simulation technology of the strong versatility, low cost, convenient use, solves the complexity and cost of large radar system evaluation in real life gradually rising problem.