In this article, we try to find parameters related to the physical properties of the target medium and the electrochemical process to extract effective induced polarization anomaly parameters from strong electromagnetic effects of natural field sources. This paper puts forward the peak phase offset and the relative apparent frequency dispersivity as the evaluation parameters of IP anomalies. The Dias model was used for the characterization of the frequency domain, while the one-dimensional layered model was applied for the forward calculation. The analysis of the phase characteristics of complex resistivity demonstrates the effectiveness of the peak phase offset parameter. The results show that the peak phase offset has a good positive correlation with dielectric polarizability. When dielectric polarizability of the target layer of some types of cross-sections is high, the peak phase offset shows good abnormal characteristics, suggesting that these parameters have an application value under specific geoelectric conditions.