Abstract: In order to explore the external factors affecting the expansion pressure and temperature changes during the hydration reaction of static crusher, the formula optimization design of static crusher was carried out based on multi−level orthogonal test, the expansion pressure of static crusher was tested by using the “outer tube method”, and the hydration reaction temperature of crusher was monitored in real time by thermometer probe. The results showed that the peak temperature of the static crusher increased first and then decreased with the increase of the water−cement ratio. With the increase of ambient temperature and mixing water temperature, the overall hydration reaction temperature undergo a process of “gentle−sharp heating−rapid cooling”. The peak pressure of static crusher in the test steel pipe increases first and then decreases with the increase of water−cement ratio, and increases with the increase of ambient temperature, but too high temperature can easily lead to the expansion pressure of the crusher nozzle to decrease sharply until it loses its expansion force. Appropriately increasing the mixing water temperature can promote the hydration reaction of the static crusher, and the mixing water temperature should not be higher than 35 ℃. increase the mixing water temperature on the static crusher hydration reaction to promote the role of mixing water temperature should not be higher than 35 ℃.