The high repetition electro-optical Q-switched red laser is studied based on the polarized characteristic of Nd∶YAP crystal.The parameters of the three-mirror folded are optimized by the thermal focus length of Nd∶YAP crystal.The electro-optical Q-switched of LN crystal and typeⅡnoncritical phase-matching intracavity frequency-doubling of KTP crystal are adapted.Then the output peak power with 28.3 kW,about 76 ns of pulse duration at 670 nm and the frequency doubling efficiency of 37.1% are obtained in the condition of 75 A pump current and the electro-optical Q-switched repetition rate of 1 kHz.