A navigation simulator is a necessary means to construct a dense, complex and changeable electromagneticenvironment of a navigation equipment in an internal field test environment. In order to solve the defects of traditional simulator,such as large volume, high weight and high cost, a new simulator based on ZYNQ-7000 All Programmable Soc (ZYNQ) +AD9361 isdesigned. The AD9361 is controlled by the upper computer to simulate the function of a navigation simulator. The test results showthat the simulator can achieve full channel coverage of a navigation device with high output power, and can constructelectromagnetic environment of a navigation device in multiple internal fields.