The relations between SIP real parameters of underground anomalous body and apparent complex resistivity spectra can be expressed by the combination of Cole-Cole models and dilute coefficient. In this paper, we use the modeling expression to compare several SIP inversion schemes with Cole-Cole model, and bring forward a new inversion scheme, it is fixing the polarizability of polarizable object body and adjacent rock, then simultaneity inverse other SIP parameters. Through a great deal theoretic checking computations, we find when polarizability is fixed, this inversion scheme has good stability, veracity and velocity.