In this paper,according to the problems existent in spectrum IP and phase IP work,the authors put forward a new method of sine wave phase IP. By using the narrow-band filter based on single frequency sine wave signal,the interference can be attenuated by large db, and phase shift of fixed frequency filter can be compensated. In the case of sinusoidal waveform locking,IP absolute phase can be carved directly and read with single-chip microcomputer counter. The resistivity is calculated by A/D acquisition amplitude positioned at sine wave peak. The sine wave phase IP working frequency is 1Hz~12.5Hz,and it has the advantages of simpleness and quickness,low equipment cost,relatively low electrode grounding requirement,rapid geophysical prospecting measurement,and strong capability of anti-power frequency harassment and anti-stray DC interference. This method is especially suitable for mine geophysical prospecting, which can overcome the disadvantages of current frequency domain IP such as high cost, low efficiency and unsuitability for fault survey. The method expands the new applications in the mine production.