Thermal characteristics of multiple laser stripes integrated into one chip is investigated theoretically in this paper.The temperature patte of the laser diode mini-array packaged in a TO-can is analyzed and optimized to achieve a uniform temperature distribution among the laser stripes and along the cavity direction.The temperature among the laser stripes varies by more than 5 K if the stripes are equally arranged,and can be reduced to less than 0.4 K if proper arrangement is designed.For conventional submount structure,the temperature variation along the cavity direction is as high as 7 K,while for an optimized trapezoid submount structure,the temperature varies only within 0.5 K.