To study springback on the side wall and bottom of square cone part made of magnesium alloy AZ31B, with the help of Abaqus finite element software, single factor experiment method was used to study the influences of four factors including forming angle, forming temperature, pressing amount and area of bottom sheet on the springback on the side wall and bottom of forming part. The results show that the greater the pressing amount is and the larger the forming angle is, the greater the springback amount is on the side wall of forming part. The greater the bottom area of forming part is, the greater the springback amount is on the bottom of forming part. If the forming temperature is higher, the smaller springback amount is on the side wall of forming part, and vice versa. The maximum springback on the side wall of forming part occurs at the position where the forming depth is about 14-18 mm, which is below the middle position of forming depth, and the springback value is 1.2-2.1 mm. The maximum springback on the bottom of forming part appears in the center of sheet and its springback value is 0.6-1.1 mm.