In order to satisfy the application of vertical cavity surface emitting laser in micro atomic clock and military communication,it is very important to optimize the structure parameters of the laser to improve the cavity mode position and to improve the optical field distribution of the optical signa l in the top layer integrated grating.Based on the gain cavity detuning technique and the excellent beam conv ergence and polarization beam splitting function of grating,a 894nm vertical cavity surface-emitting la ser is proposed based on non-periodic subwavelength grating.Using the polariza tion beam splitting function of grating,we can make the extinction ratio of the output port of the device greater than 30dB.By impr oving the cavity mode position and the oxidation aperture,the basic performance of the device is kept stable in the range of 20℃ to 90℃,and the working wavelength of the micro atomic clock is satisfied at 85℃.The output power is about 2mW.It provides a good theoretical basis for the development of the next generation miniature atomic clock and military communication.