Power flow calculation is an important solution of determining the basic data of electric system. Optimal power flow is the condition of maintaining low cost for the entire power system. The article expounds how to achieve the minimum value of cost function by adjusting the output of generators on the basis of Newton-Laphson. It has significant meaning for judging the optimum operation and development of present system.%潮流计算是用来确定电力系统基本数据的重要解决方案，最优潮流是整个电力系统成本最低的条件。基于牛顿—拉夫逊法，通过调节发电机的输出口来实现成本函数的最小值，对于判定现有系统的最佳运行和发展具有重要意义。
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