As the tool of Hybrid Simulation(HS), Hybrid Testing System(HTS) is developing toward distributed and complex direction. It is difficulty for the beginners to understand the process of HS and for the researchers to focus on a particular field. Herein a basic HTS is studied. Firstly, Simulink simulation environment is introduced. Then, the basic principle of HS and the framework of HTS is elaborated, A HTS based on Simulink simulation environment is proposed, and some key problems in HS are discussed. Finally, HTS simulation and validation are carried out using a simplified loading system model and a real loading system respectively. The results indicate that the modules of the HTS can work together and it can easily implement hardware in the loop simulation.