One trip drilling technology is an important way to achieve safe and fast drilling and completion， reduce cost and increase efficiency. One trip drilling technology was adopted in Liulin CBM drilling， and drilling efficiency and economic benefits were significantly improved. Analysis of 7 completed “L” type horizontal wells showed that： proper selection of drilling equipment and the PDC bit suitable for stratigraphic characteristics， and real time optimization of the drilling fluid system provided basic guarantee to single trip operation； and the MWD survey tool of advanced technology， good performance and reliability， optimization of well trajectory， and accurate geo-steering were the key technology. Application of new technology such as long life mud motors， near-bit rotary steering systems， will certainly help with extensive use of the single trip technology in the region.