The DC transmission power of UHVDC transmission project is set according to the daily power plan made by dispatching system, and the sending and carrying out of the power plan directly influence the stability of the DC system. Based on the in-depth study of IEC60870-5-104/101 and the engineering application of UHVDC transmission project, a function extension of the RCI system and SCADA system are made, a real time transmission, receiving, analysis, display and storing of the power plan are realized based on IEC60870-5-104/101. The automatic power control is realized in the SCADA system, which sends power value automatically to the control systems with high instantaneity and responsibility. The transmission of the power plan and the realization of the automatic power control could improve the efficiency of operators, and there is significance on improving grid security.