Abstract: The practical experiences of tight oil development abroad indicate that the combination of proper engineering technologies with factory?like operation pattern is an important tool for economic and efficient production of tight oils. Based on the characteristics of tight oil in Jimusar sag of Junggar basin, this paper recommended a factory?like drilling test of cluster horizontal wells as follows: 1)12wells in a drilling pad were arranged, the horizontal section extensions paralleled to the minimum principal stress orientation, and the distance between adjacent sections was 300m, with the horizontal?section lengths of1300m and1800m; batching drilling operation pattern was adopted, with3?well drilling for each of rig;2)five?section profile was used for three dimensional horizontal well in track design, realizing the fine track control by combination of screw rod directional tool with rotary steering drilling tool; 3)the optimization of wellhead spacing is run by hydraulic drive slide rail for quick rig moving; 4)constructing central treatment station to maintain or treat drilling fluid for increaseof repeating utilization factor of drilling fluid. Case study shows that the average rate of penetration of factory?like drilling can reach 9.19m/h, increased by5.87%compared with conventional drilling; the average drilling cycle is64.88days, shortened by19.65%; the repeating utilization factor of drilling fluid reaches28%. Hence using this drilling technology can effectively reduce the cost, improve efficiency and/or benefit