In order to promote the refined transformation of urban road design and improve the street crossing safety, the turning radius of curbs at intersections has been correspondingly reduced in recent years. To address the significant reduction in sidewalk space at intersections caused by the reduction of curb corner radius, three major factors determining the sidewalk space at intersection are firstly analyzed, such as the traffic space, green space and red light waiting space. Then, a typical intersection in Beijing is selected to determine the waiting space range. Finally, by considering the size of the red line corner cutting of different levels of roads, the distance for the sidewalk corner cutting to retreat under different curb corner radii is given. The conclusion is that when the radius of the curb corner is 5 m and 8 m, and the distance of the sidewalk corner cutting to retreat is 5 m and 3 m, the requirements for waiting space, traffic space and green space can be met simultaneously.