射孔、压裂是石油勘探与开发过程中的一项关键技术，射孔、压裂瞬间动态压力参数为评价射孔施工效果，深化射孔、压裂工艺机理研究，新的射孔、压裂产品研发等提供理论依据。为了测取射孔、压裂过程中动态压力信号，研制了一种适用于石油井下恶劣环境中的动态压力测试仪（P～t仪），-or harsh environment of the oil down-hole, and capture the dynamic pressure　signal successfully in perforation and fracture many times. To clear the quality of test results, based on the existing theory of uncertainty, research on the dynamic uncertainty principle of assessment based on error sources, evaluate dynamic uncertainty caused by pressure testing system, q