As the main lifting system power equipment of deep well drilling rig， the advanced design of winch is of great significance to the overall performance， efficiency and cost control of drilling rig. At present， the domestic and foreign deep drilling rig generally uses asynchronous variable frequency motor and gear reducer as the winch transmission device， which has low speed （constant pressure， constant speed drilling） instability， complex structure， heavy maintenance workload， high energy consumption cost. Based on the existing lifting power design technology of drilling rig， this paper presents the design and application of a permanent magnet synchronous motor in the lifting system of deep drilling rig. First， a dual motor direct drive system without gearbox was designed according to the characteristics of permanent magnet synchronous motor， and then the corresponding electronic control system was designed based on the vector closed-loop control technology. Finally， its typical operating characteristics were tested and analyzed on the practice， and the energy consumption was compared by comparing the traditional electric drilling rig of the same model in the same well site and the relevant conclusions were drawn. In contrast， the permanent magnet synchronous motor drawworks has the characteristics of simpler structure， lower maintenance and energy consumption costs. The operating characteristics and energy consumption of the same type of drilling rig are analyzed and compared.