The geothermal Well CGSD-01 is located in Dongli Lake, TianJin and is part of the tectonic area of Tianjin Panzhuang Bulge. The design depth of the well is 4000m and the completion depth is 4051.68m. One of the main purposes of the well is to obtain geological data of various strata by staged core drilling. An effective coring solution has been found through attempts at combination of different coring tools and drilling methods, which successfully solved the problem of low core recovery in the third stage drilling in Wumishan Formation with high-quality cores obtained. Through comparative analysis of coring with various technical schemes, the key coring technologies for deep geothermal wells have been summarized, providing some experience and guidance for future core drilling.