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The top drilling device represents cutting-edge technology and equipment in modern oil drilling; it reduces drilling time by 20% to 25% and helps prevent stick-slip accidents. The significant economic benefits it offers, especially when drilling inclined wells or highly challenging directional wells, indicate that it will surely become an important trend in the development of drilling machinery in the 21st century. A top-drive drilling system includes a lifting system, a rotational power system, an automated drill string handling device, an internal blowout preventer in the drill string, and an intelligent control system; it is a high-power, highly automated integrated system that combines mechanical, electrical, and hydraulic technologies. The top drive system moves together with the derrick during operation; it provides a mud circulation path, blowout preventers within the drill string along with controls for them, as well as functions for connecting and disconnecting the drill string, and it supplies rotational power to the drill string. The system is subjected to comprehensive intelligent control through the use of various advanced technologies such as Siemens S7 300 PLC programmable controllers, PROFIBUS-DP fieldbus for control, fiber optic communication, remote monitoring, and a human-machine interface (HMI), thereby significantly enhancing the intelligence level and reliability of the entire system.