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A lot of facts prove that the combined of seismic methods and electrical methods can greatly improve the success rate of exploring oil and gas and shale gas, but only seismic methods.The traditional electrical methods are less sensitive to high resistivity than the low resistivity.Therefore we need to develop the related technologies.For this, this paper carried out the study of numerical simulation for the ground source transient electromagnetic, and found that the Ex field of impulse source and Ex field of step source has better detection ability than MT method, and the apparent resistivity is more than 1.88 times than MT if the distance is suitable, that receiving point is far away from the source.The effect of the method is different, for different sets, different distances, that receiver point is far away from the source, and different fields.Finally, the paper gives different conclusions, through comparing the advantages and disadvantages of them.