By inserting a lenswith f = 70mm and a <1mm op tical－stop in the resonator of a plane－plane Cr4 + ∶Nd3 + ∶YAG longitudinal－pumped microchip laser, high stability laser pulses with pulse width of 9. 57 ±0. 187ns and peakpower of 471 ±36μW has been obtained,while high repetition rate was 42 ±1kHz. The pumped power about 17. 2W and laser average power about 4. 7W ware measured, thus op tical efficiency of 27. 3% was achieved in this configuration,and peak2power above 13kW and energy about 115μJ of single pulse were calculated. To our acknowledgement ,these experimental results were the best performances of Cr4 + self2Q2switched laser longitudinal2pumped by laser diode in the reported papers.