Abstract: Oil well pressure test is an important work of dynamic monitoring of oilfields. In view of the urgent need for real-time monitoring of key such as downhole pressure and temperature of pumping unit wells and the problems of long cycle, data lag, high cost, inability to monitor in real time and high risk of traditional monitoring, the research on the mechanism of downhole wireless transmission has been carried out, and the wireless transmission system with long transmission distance and strong anti-interference ability has been developed The data receiving and collecting device and processing and interpretation system have been developed. The technology of downhole pressure wireless monitoring for pumping unit oil wells has been formed. Based on the indoor evaluation, the field test has been carried out for 3 times. The maximum effective transmission depth has reached 1690m. Compared with the storage pressure gauge, theity of wireless monitoring data is as high as 90%. The downhole instrument has been working continuously for more than 360 days, which has realized the wireless data of downhole pressure and other parameters "sent, transmitted far and received". It meets the technical requirements of reservoir dynamic monitoring and provides new means for fine monitoring of oil wells efficient management of wellbores.