AN style="FONT-FAMILY: AdvOT596495f2; COLOR: rgb(0,0,0); FONT-SIZE: 7.173pt; mso-spacerun: 'yes'">In recent years, COacerun: 'yes'">2 acerun: 'yes'">phase transition jet (CPTJ) coal-breaking technology has been reported to increase coal acerun: 'yes'">seam permeability. However, the structural evolution eacerun: 'yes'">ffffacerun: 'yes'">ect of coal subjected to CPTJ technology is unclear, acerun: 'yes'">which restricts widespread CPTJ technology application. In this study, a laboratory experimental system and acerun: 'yes'">fifiacerun: 'yes'">eld technical equipment were developed, and coal-breaking experiments under diacerun: 'yes'">ffffacerun: 'yes'">erent CPTJ pressure conacerun: 'yes'">ditions were conducted. We investigated pore structure changes by combining scanning electron microscopy acerun: 'yes'">(SEM) and mercury intrusion porosimetry (MIP) to better understand the coal pore structure evolution characerun: 'yes'">acteristics under diacerun: 'yes'">ffffacerun: 'yes'">erent CPTJ pressures. Furthermore, an enhanced coalbed methane (ECBM) recovery exacerun: 'yes'">periment using CPTJ coal-breaking technology was conducted with the self-developed technical equipment. The acerun: 'yes'">results show that notable damage occurs in the coal body inacerun: 'yes'">flflacerun: 'yes'">uenced by CPTJ, and the damage area increases acerun: 'yes'">with increasing jet pressure. The SEM results revealed that more pores and cracks are produced due to liquid COacerun: 'yes'">2 acerun: 'yes'">CPTJ, and the porosity and crack size increase with increasing jet pressure. MIP analysis indicates that the pore acerun: 'yes'">structure of the breaking coal samples mainly includes macropores, and coal sample macroporosity increases acerun: 'yes'">signiacerun: 'yes'">fifiacerun: 'yes'">cantly with increasing jet pressure. The acerun: 'yes'">fifiacerun: 'yes'">eld ECBM experiment showed that CPTJ technology can reduce acerun: 'yes'">the coalbed methane (CBM) drainage decay coeacerun: 'yes'">ffiffiffiacerun: 'yes'">cient and increase the CBM extraction pure acerun: 'yes'">flflacerun: 'yes'">ow rate and acerun: 'yes'">recovery eacerun: 'yes'">ffiffiffiacerun: 'yes'">ciency 8.3acerun: 'yes'">–acerun: 'yes'">10.4 and 20.4 times, respectively.