Abstract: Kongque 1 well is the first well being put into formation testing in Kongquehe block in Tarim basin. The goal of formation testing is to achieve each layer's fluid properties, deliverability, pressure and the relevant formation appraisal parameters, so as to provide a basis for future seismic interpretation and comprehensive study of petroleum geology. Solid - free well control fluid and underbal-anced perforation technology are used, and much attentions are paid to amortization and safety factors of testing pipe string in deep wells when designing pipe string structure. Perforation and testing are carried out jointly and perforation is carried out with deep penetration and large aperture diameter methods. The success ratio of formation testing is improved.