The method of load in standards and documents is analyzed, then different types of load are simulated by fault model. Based on compensation method, short circuit current is calculated considering load, and the voltage and current variation index are defined. With the variation index, the influence of load location and load level on the grid voltage and current is concluded. The fast method of compensating short circuit current calculation considering multiple load is proposed, the original network matrix is not modified and the time of short circuit current calculation is reduced by the method. Finally, IEEE9 node example is provided, it is suggested to use the method and index to select load on short circuit current calculation.