Abstract: Based on the field measurement results of 122107 fully mechanized top coal caving face with large mining height in Cao Jiatan Coal Mine, the time of each working procedure and the operating rate of the working face system are systematically summarized. The main methods to optimize and ameliorate the technology of Cao Jiatan fully mechanized top coal caving face are put forward, Which, moderately increase the length of the working face to 350 m, increase the cutting depth of the coal shearer to 1.0 m, and increase the cutting speed of the shearer to 6~8 m/min; The time for support moving should be 15.5~17.3 s, the time for pushing the scraper forward should be 8.2~9.6 s, the time for pulling the scraper backward should be 8.1~10.2 s, the time for extending the fender should be 8.6~10.2 s, and the time for pulling the fender back should be 17.1~25.7 s. The coal drawing method should be adjusted to "double round of coal drawing in groups", so that the monthly output of the working face can reach 1.62~2.17 million tons, the annual output can reach 17.84 million t~23.9 million tons, and the mining efficiency will be 1.8~2.4 times of the current stage, These results are of great significance for optimizing mining technology and intelligent design.

Key words: ", Double round of coal drawing in groups"