Abstract: In this article, we designed a Dirac semimetal metamaterial resonator in terahertz with an asymmetric double open loop metasurface structure.It Can be applied in amplitude modulation of terahertz frequency band.The study compared the influence of structural parameters and Fermi level on resonance amplitude.The results indicate that as the degree of symmetry defect increases, the resonance peak of the resonator gradually shifts red, and the resonance amplitude shows a trend of first increasing and then decreasing.As the Fermi level of Dirac semimetal metamaterial increases, the resonance peak amplitude of the resonator increases.When the Fermi level is 200meV, a 99.4% amplitude modulation depth is achieved near 0.38 THz.