Generally, it is unnecessary to control wellhead pressure in geological exploration drilling, while for Yang D 1 well in Jinlingsi Yangshan basin of west Liaoling, the oil and gas exploration was carried out with the drilling method of geological exploration wells, wellhead pressure control measures should be prepared, and the coupling of geological drilling equipment and well control device is the focus of this paper. Take this well as the example, the construction process of oil and gas exploration well with full hydraulic core drilling rig for full hole diamond core drilling is presented. The space dimension below YDX-6 full hydraulic core drilling machine platform, casing program design, wellhead pressure control and some other requirements were taken into account in drilling operation, a set of well control equipment is determined and designed, which can meet small-diameter core drilling construction.