Beijing metro Olympic branch is a part of Beijing rail transit network Line 8, the starting point is Xiongmaohuandao and the terminal station is designed at the south gate of planned Forest Park. The U-shape groove structure undercrossing Beichen Bridge is an important risk control point with subsurface excavation method, the engineering safety is extremely important. The ground traffic in Beichen Bridge area is very complicated, traditional tube well dewatering could not be applied and overall dewatering was made by radial wells. The paper introduced the radial well dewatering about the construction design, construction technology requirement and the dewatering effect.