The mud pump plays an important role in drilling as the main matching drilling equipment. At present， most of high-power electric driving mud pumps are driven by AC asynchronous motors with the combination of the air bladder clutch， bearing chock and pulley for transmission to achieve speed reduction. With the need of exploration and development of onshore clean energy such as geothermal （hot dry rock）， shale gas， and deep resources， higher requirements are also put forward for high-power electric mud pumps. Through analysis of the requirements of the Xiongan new area geothermal drilling project， the variable frequency permanent magnet motor is adopted to drive directly the pinion shaft of F-1300 mud pump. It has the advantages of simple drive structure， stepless speed regulation， energy saving and high control accuracy， and caters to the development of modern geothermal drilling technology， upgrades the overall level and capacity of drilling rig， and improves drilling efficiency and quality.