The blasting mechanism is the use of liquid carbon dioxide gas phase and the expansion of rock breaking, according to relevant data, its working principle is: "compressed liquid carbon dioxide into the expansion tube, the expansion tube root connected into drill hole in advance of dressed, by stimulating the appropriative, making carbon dioxide from liquid a gaseous product, gaseous carbon dioxide through the expansion of the rock. According to the information presented in the standard state (temperature 15 degrees, pressure 1 atmospheric pressure) carbon dioxide volume in 0.4 seconds, the speed increased by about 600 times. In the case of non coupled structure expansion, the pressure of the CO2 liquid in the expansion tube will increase rapidly when the liquid is excited to become a gas. When the gas pressure exceeds the pressure threshold of CO2 jet at the mouth of the jet bursting disc rupture, injection of CO2 gas from the jet mouth to rock hole. CO2 gas jet out of the spread between the expansion pipe and rock hole, and then collide with the rock hole, the formation of disturbance source rocks formed in the initial stress wave, through the quasi static pressure and wedge effect will rock crack coalescence, resulting in rock fracture, so as to achieve the purpose of breaking rock. The liquid gas phase transition of CO2 expansive rock breaking rock can be broken micro vibration, low noise, zero flying rocks, and does not violate any of the provisions of the public security and safety supervision department of the rock crushing.