Abstract: In this paper,it designs and implements a test system of analog signal based on remote communication with a spectrum analyzer. On the one hand, the test system controls the embedded equipment to generate the required analog signal which is then transmitted to the spectrum analyzer through the host computer. On the other hand, through the friendly interface designed by VC software, it can flexibly control the communication with the spectrum analyzer, obtain the data of the spectrum instrument for storage and analysis so as to quantitatively evaluate and test the input analog signal. The test results show that the test system can set the parameters of spectrum analyzer through remote communication, from which it acquires and analyzes the data so as to quantitatively analyze and test the input analog signal.