Plasma-induced transparency（PIT）is a novel optical response characteristic, which has unique advantages in applications such as sensors.In this paper, we present an optical model which is coupled by a double-ring resonator and a straight waveguide, and explain the cause of the multi-band plasmon-induced transparency effect.The influence of the main structural parameters on the transmission characteristics of the structure is analyzed by using the finite-difference time-domain method method.The inner and outer radius of ring resonators Rin,Rout and the width of ring resonators WR have different red shift effects on the transmission characteristics is studied,it is found that Rin and Rout are too large and too small to be conducive to the phenomenon of plasma induced transparency.After optimizing the parameters, a nano-sensor with a sensitivity of 1014.10 nm/RIU and a high quality factor of 90.65 is designed, which has the advantages of simple structure, easy integration, convenient fabrication and low cost, it can be well used in the field of high integration and high precision sensing detection.