Abstract: The plane survey network of Dongfeng Hydropower Station in Guizhou Province was constructed in 1993. At first, there were six points in the network and now eight points contained. Nine-time observation results accumulated in 1997. The two points in the network were damaged in 1998 and produced a bad influence on the use of the network. This paper discusses the methods and steps of the coordinate location after the recovery of the two points,and gives an evaluation on the precision and survey efficiency of the methods.?