Abstract: Hydraulic fracturing is the main method to reservoir reconstruct in Chanqing low - permeable oilfield.Accurate monitoring of artificial fracture parameters for optimizing the design and promote technological progress is particularly important. Earlier fracture monitoring technologies have certain limitations,in order to obtain accurate fracture parameters, and thus more effectively evaluate the effect of hydraulic fracturing,the technology of zerowash tracer fracturing diagnostics was introduced.The technology uses zerowash tracer with advanced imaging tracer logging technique.It can reflect the spread regularity,height,width and distribution of proppant intuitively clear after fracturing.The application of this technology can provide good reference to engineers to analyse effection and optimize design of fracturing.