Abstract: As the fundament of wire array Z pinch experiment, the design of the load is very important. In this paper, the slug model is introduced. On the basis of analyzing the principle of the model, the wire array experiment results on Saturn generator are used to test the model and the program. The calculation results prove the program is of better reliability and practicality. After analyzing Qiangguang I generator's circuit and getting the electric parameters of the generator, the wire array experiments on the Qiangguang I are simulated by the slug model. The calculated load current results well agree with the experiment results and the errors are within 5%. This indicates that the slug model will be helpful to the design and the experiments on Qiangguang I generator.