Abstract: By analyzing the channel characteristics, excitation mode, FSK (Frequency Shift Keying), FIR (Finite Impulse Response), BCH (Bose, Ray, Hocquenghem), HPSRR (High Power Supply Rejection Ratio) of underground wireless transmission, a set of underground short-distance wireless data transmission system has been developed.Ground tests of the system, such as simulation test of ground simulation environment, power consumption test of the system and simulation test of high temperature resistance of the system, are carried out.And the system has been applied in a well of offshore oilfield.Field application shows that, the system overcomes the problems of poor high temperature resistance and short receiving distance of direct reading technology for offshore oil field test.The changes of downhole pressure and temperature are accurately recorded during well opening and shutting-in of test operation.The feasibility of wireless transmission of underground signal is verified.