In Cangzhou deep salt mine survey project, coring in 500～3290m section of the completed ZK002 was carried out. Deep and shallow double-hole was designed and geological and petroleum drilling equipments were used respectively. The conventional core drilling technology and drilling coring technology were combined to realize the complementary advantages of 2 types of equipment and different coring processes, the construction risk reducing, drilling quality ensuring, construction cost saving and construction period shortening.