In order to avoid the measurement error brought by heating before heat test in hypersonic wind tunnel, it’s essential that the model should insert into the flow field quickly. Accordingly the model quick-insertion mechanism has been developed. The mechanism, which is driven by gas-liquid increase-speed cylinder and servo proportion reversing valve, can quickly release the model when the flow field is built. The control system has adopted IPC centralized-control, electro-hydraulic servo, AC servo and industrial field bus technologies, so mutual independent multiple freedom motion control circuits have been built. By high-speed data acquisition and analog output, reading CPU work frequency etc, the control system has solved the difficult question of fast insertion and timing. The test results show that the mechanism can cut in the flow field quickly during heat test and operate stably. All the technical indexes have been meet. So, the design of the control system is reasonable.