Abstract: The evaluation variable control of the pulses was introduced to the scenario of sequential PRI estimation in this paper,enabling a higher-precision parameter estimation of pulse sequences contaminated with data noise such as missing and interference pulses. Furthermore, a probing integer division method was applied to the pulses within the buffer interval to track and detect the discontinuity moments of PRI switching in the pulse Doppler radar intercepted pulse sequence. Simulation experiments verified the effectiveness and superiority of the proposed sequential PRI estimation method compared to traditional PRI parameter estimation methods in sequential estimation scenarios.