Responder deception jamming and high repetition rate jamming are two main methods of laser active jamming. In his paper, a circuit was designed, whose work mode can be either first pulse guidance or last pulse guidance. The circuit can verify the effectivity of this two methods and the anti-jamming effectivity of last pulse guidance. Guidance mode, width of time gate and guidance encode can be set on-line, dynamic range is 138.47dB and the maximal sampling and hold error is 0.24% when the gate time is typical value 20µs.