Due to the tunnel cavities and a variety of engineering facilities in the tunnel, the resistivity anomaly is subject to serious distortion, which will increase the difficulty of data interpretation and accurate locating of the abnormal body. In this paper, the finite element method was used to calculate the tunnel environment response,the resistivity calculation method under the special tunnel condition was analyzed, and computer modeling experiments were conducted. And then, according to the environmental anomalies in different survey lines, three different models were designed to calculate the effect of tunnel environment on the detection of surrounding abnormal bodies. The ratio method, difference method and integrated correction method which are used for reducing the false anomaly resulting from tunnel environment were employed. The results show that it is necessary to remove the tunnel environment anomaly before the interpretation of measured data, and the above methods can be used to eliminate the environmental influence of the tunnel.