Abstract: The bottom completion of the deep well with long horizontal section in the East Sea gets blocked frequently. Based on the summary and analysis of the conventional completion process, through optimization of the liner hanger system and application of disposable rotary steerable motor, this paper presents an innovation method in the bottom completion of the deep well with long horizontal section.Through the simulation by using software and field practice application, it is proved to be effective to solve the difficulties of the completion string entry and the large loss of completion fluid. This provides a powerful reference for running case during the well drilling process of late large displacement and bottom completion of the deep well with long horizontal section, and can meet the requirements of exploration and development.