Abstract: Based on the idea of the game theory, the problems on dynamic evaluation for radar jamming effects are studied. Through acting the jamming effects as payoff function, it quantificationally describes the jamming effects in the time, space, frequency, and energy. And the synthetical evaluation method is presented. Then the game tactical matrix model of Electronic Counter Measures (ECM) is established. The calculation methods of dynamic evaluation for radar mask jamming effects are proposed. Combining a practical example, the novel method is used to make effects evaluation for the radar mask jamming. The results show that the method is well suitable to modern ECM and therefore is available and credible for evaluating danamically radar mask jamming effects.