Abstract: In viewing the problems existed in conventional pres-sure build-up testing technology in water injectors,a con-veyance and recovery technology through high pressure re-lease for pressure build-up test in injectors is developed.It does not need well test vehicles,and the conveyance and recovery of manometer is accomplished under high injection pressure conditions by making use of the structure of the tool itself,thus the production efficiency is increased.This paper introduces the structure,principle and the main technical parameters and the field application effects.