The time-frequency electromagnetic method (TFEM) has been developed and refined along with its applications in the last decade. BGP has contributed much to its development in areas of data acquisition, processing, and interpretation. For example, we have developed a super-powered transmitter, an on-site and in-house data processing and interpretation system, and a multiparameter inversion algorithm for induced polarization and resistivity (IPR). We have successfully applied TFEM in China and overseas for decades and obtained rewarding results. The method has two major functions: one is to evaluate the traps discovered by seismic data and the other is to determine optimal drilling locations. TFEM results can also serve as a key reference for seismic survey design. In this paper, we briefly review TFEM and present a set of examples.