With the background of well ZK001 drilling project for potassium salt survey Xuanhan County of Sichuan Province, the drilling construction technology of potassium salt parameter well is summarized in well structure, drilling tools combination, drilling fluid technology, coring technology, well deviation control and deep pumping tests. In view of the technical difficulties such as super-long open hole drilling, hole leakage and long-section gypsum salt layer drilling in the construction process, by the countermeasures of optimizing drilling tools combination, adjusting the performance of drilling fluid