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This Letter proposes a novel method for enhancing terahertz(THz)radiation from microstructure photocon-ductive antennas(MSPCA).We present two types of MSPCA,which contain split-ring resonators(SRRs)and dipole photoconductive antennas(D-PCAs).The experimental results reveal that when the femtosecond laser is pumping onto the split position of the SRR,the maximum THz radiation power is enhanced by 92 times com-pared to pumping at the electrode edge of the D-PCA.Two π phase shifts occur as the pumping laser propagates from the negative electrode to the positive electrode.Analysis shows that photoinduced carrier charges move within the split position of the SRR.