This paper presents the simulation and design methods of digital tunable frequency hopping filter based on ADS. The filter simulation parameters have been calculated according to the theory of lumped element couple filter. The filter circuit including the parameters of microstrip line and PIN diode has been simulated by using ADS to solve the value taking problem of the capacitance array of digital tunable frequency hopping filter. The validity of the proposed method has been verified combining the ADS simulation data with the test results.