The retrievable casing is often used for coring drilling in large diameter deep well construction to increase the drilling efficiency, improve the loading conditions of drill string and seal unstable strata. Because of the complex strata, the large stress and the difficulties in controlling the wall inclination and stability, the prevention of retrievable casing accident is important. The paper introduces the methods of retrievable casing lowing and the relative measures, puts forward the solutions to the related problems that may arise in the construction process.