Abstract: High level directional drilling construction of roof in complex strata of Huainan Coal Mine and the problem of caving of borehole in gas extraction process causes blockage of gas extraction channel, the whole process screening technology of high directional long drilling in the roof of complex strata is studied. Field tests have been carried out in Zhangji Coal Mine. Through problems of running screen encountered in the construction process of complex formation of fragile low hole, low PVC screen strength, influence of steel screen on measuring system, complex running screen process, difficult treatment after blockage, technical measures, such as ensuring smooth track, using steel screen tube, timely pipe discharge after completion of single drilling, cutting type guide head and auxiliary reducing diameter of screen tube, were proposed. The average running screen pipe rate of drilling was more than 97%, and the whole process of running screen pipe was basically realized in high level directional long drilling of the complex roof, which ensured the gas extraction effect. Using the developed technical measures, the maximum running depth of ?准73 mm steel screen tube was successfully realized in the south area of Guqiao Mine, creating the running depth record of ?准73 mm steel screen in the underground coal mine of 744.6 m, promoting the comprehensive promotion and application of the technology of “replacing roadway with hole”.