Abstract: A evaluation method for resisting force of mining excavator is described。The mathematical model is built up for the method, and program is made for solving variables in the model by Visual Basic。Building up mathematical model for the mining excavator is for resolving resisting force during the digging。The program is made by the VB, the program can provide track and resisting force of excavator during digging range or under different working environment。Experimental results and other methods show that the method is effective。