Abstract: On the base of the thermal-elastic theory, the three-dimensional finite element numerical analysis simulated distribution of temperature, strain and stress in the modest hot slides with ANSYS sequential coupling analyzing heat transfer and stress equations. The results show that the highest temperature rises with increasing of height of the slide and reduces with increasing of length of the slide, and the highest temperature of trapezoid slide is lower 15-20℃ than that of rectangle slide at the same time. The highest equivalent stress for the rectangle slide is bigger than that of the trapezoid slide at the same time, and it lies in weld and rises with increasing height and length of the slide.