Induced polarization parameter extraction method and system for magnetotelluric observation data

The invention relates to an induced polarization parameter extraction method for magnetotelluric observation data. The method comprises the following steps: respectively assigning initial values to zero-frequency resistivity, polarizability, time constant and frequency correlation coefficient to obtain an initial geoelectric model; establishing a target function according to a standard error term between the electromagnetic observation data and the electromagnetic theoretical data and a focusing constraint condition of the geoelectric model; calculating an optimal damping factor according to a fitting difference between the electromagnetic observation data and the electromagnetic theoretical data; calculating a Hessian matrix according to the apparent resistivity and the impedance phase in the electromagnetic theoretical data; calculating a correction amount according to the target function, the optimal damping factor and the Hessian matrix; correcting the earth electricity model according to the correction a