The East China Sea oil and gas field is currently one of the main offshore exploration and development areas in China, where the main reservoirs are deeply buried, the compressive strength of deep strata is above 100MPa with the conditions of poor drillability and high formation temperature. There are problems of wellbore instability, low ROP, difficult trajectory control and some others in drilling process. In view of the above, through the investigation of the related efficiency raising technologies both in China and abroad, the research and practice of effective drilling in the deep formation of East China Sea are carried out and hydraulic impact tool is selected, which has the advantages of simple structure and high reliability. By the analysis on the installing location and the optimization of operation parameter, the existing drilling equipment and technological parameters are kept original, while the innovative coordination of rotary steering and hydraulic impact tool is put forward, in the application of wellX4H, the ROP is significantly improved by 30%～200%.