Abstract: Tianlai radio array, which has high sensitivity and large field of view, can detect and capture multiple small space objects at the same time. It has decent capability of detecting the space objects, and can be used as one of the space object monitoring equipment. In this paper, the detection capability of Tianlai radio array is calculated when the incoherent scattering radar in Qujing city is assumed as a source of transmission. Then a method for direction-finding of space objects is proposed, which is based on phase difference measurement. The relationship between direction-finding error and direction-finding angle of space objects is also analyzed.