In order to transform coordinates from WGS84 to CSCG2000 for GPS engineering control network, the ITRF displacement velocity of the stations must be solved accurately. The displacement velocity data are necessary to obtain the velocity field in GPS crustal deformation monitoring network. On the basis of continual observations of CSCORS stations, we discussed two algorithms for calculating the displacement velocity: the weighted interpolation algorithm and dividing coordinates difference by time difference. The second method can be used for the continually observational GPS network, but for GPS engineering control network only the interpolation algorithm can be used. The displacement rates of CSCORS stations in three periods had been computed accurately and it is found that the displacement rates are nonlinear. The examples show that the displacement rates computed by two different methods are consistent, thus the weighted interpolation method can be adopted to solve the rates of stations in GPS engineering control network.%讨论两种测站位移速率的计算方法,一是位移速率的加权插值；二是坐标差除以时间差.对于长期连续观测的GPS地壳形变监测网,可以采用坐标差除以时间差；GPS工程控制网的位移速率只能采用加权插值计算.采用两种方法精密解算了CSCORS基准站三个时间段的位移速率,发现不同时间段测站位移速率存在非线性变化.两种方法总的位移速率具有一致性,表明GPS工程网可以采用插值计算法求得测站的位移速率.
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