Well Ma02 is a horizontal monitoring well located in the fault block of well block Ma13 in Mahu Sag of the central depression of Junggar Basin. The conglomerate strata of Baikouquan Formation in this well block are broken after volume fracturing，and are very difficult for coring. For 270 m continuously coring in the horizontal section of well Ma02，there exist many uncertain factors，and it is difficult to control the trajectory. The horizontal well conformal coring technology developed by Research Institute of Engineering Technology，CNPC Western Drilling Engineering Co.，Ltd. was used，and the problem of loose and shapeless in target layer coring was satisfactorily solved^[1]. It has been proven by continuously multi-barrel coring practices that this technology can effectively improve the core recovery in horizontal sections，providing experience for coring in loose strata. The adopted tools，technical parameters，technical measures and actual application results of this coring technology are introduced in details.