Because of its strong anti-multipath capability and other characteristics,UWB technology is widely used in positioning.When using UWB,unstable phenomenon of the positioning results still remained.In this paper,an improved UWB space location method which can be used in the conditions that don't need real time positioning is proposed.A distance optimization method is proposed and then the distance intersection of space method which uses three base stations to solve spatial positioning is infroduced.Experimental results show that the proposed method is simple and easy to implement.Besides,it is with small computation cost and high accuracy of positioning.At the same time,because the method only needs three base stations to measure the three-dimensional coordinates of the tested point,it can save hardware cost to a certain extent.Finally,this method is suitable for warehouse location and power plant inspection personnel positioning and other scenes in electric power department.