Abstract: Geosteering drilling technology has become an important method for stratum assessment of wells in complex structure. However, survey points of measuring parameters of conventional geosteering system feature average measuring zero length above 20 m, relatively far away from drilling stratum, thus causing relative lag of survey information, which is in particular adverse for thin reservoir development, and conventional natural gamma surveying does not have the capacity of measuring azimuth information, and cannot timely judge change of drilling tools in oil reservoir. The electromagnetic wave resistivity, azimuth gamma and well deflection integrated design technology, which is developed by Shengli Drilling Technology Research Institute and is adopted by MRC near-bid geosteering system, realizes integrated measurement of near-bit geological parameters and engineering parameters, and realizes near-bit (measuring zero length less than 10 m) measurement, greatly shortens measuring zero length It also realizes real-time monitoring of stratum feature information as well as identification of stratum change. The measurement parameters has azimuth features to enable determination of location of boundary of reservoir stratum, facilitate timely adjustment of well track, lower the risk of reservoir penetration and improve catching rate. It has been proved from field application that the system features accurate measured data, stable and reliable operation, and achieves high reservoir catching rate in single-well application. In comparison with the application effects of conventional geosteering system, the system better realizes judgment of stratum features and accurate control of drill track inside reservoirs, and improves average reservoir catching rate for single well by above 10%, and can provide powerful technical support for development of thin oil reservoir.