AD 4017 well, located Lukeqing oil field in Tuha basin, belong to I block structure in AD. There is rarely a precedent of drilling accident caused by downhole collapse in the early exploration and prospection of the block. The well structure design of AD4017 well，is designed by referencing the preliminary geological exploration data and design data of adjacent wells, It is not considered the situation that there is a thin coal bed in the drilling process. The original design is easy to lead to the instability of the well wall in this well, so the drilling accident occurred in the actual drilling process. The article through research of drilling stuck accident for AD 4017 well, deeply analysis the well collapse mechanism and reason of stuck may exist from the geological factors, physical and chemical factors, technology factors etc, which put forward preventive measures and treatment methods of pertinence for those factors lead to the sticking accident.