Abstract: According to the nozzle jammed, nozzle with serious sputering.aw seric lfe,hard to form effictive perforation problem occured in the ihyaraulic sandjet peroration procss ofthe coalbed methane wel.he paper ad a study on the factors affectedto the ihydraulieparameters of fferent hole size ijecto.With the optmization on the hyrauli parameters and stoucture of the noczde a newin ecor was designed and the tools combination of the available hydraulic sand perforation wasimproved.The study resuits showed that under the condtions of a 4× 6 mm ijctor.discharge of 1.4 mn~-3min,sand ratio of 8% and pump pressure of 50 MPa.a casingwith a thicknes of 5.5 inches/ 140 mm)could be perorated witin 15 minutes. The optimized nozde and tools combination could sove the problems of the nozde jammed.,poor ani sputtering and the pore verification of previous hydraui: sand jet peroration.The ools combinaton optimized could realize the integraton ofthe sandje perforation and round space fracturing and could reduce the time of the seam reconstruction.