In order to further improve the progressive combustion of 37-well propellant, a 37-well nitroguanidine propellant was coated by two-layer coating process. The effects of coating, compatibility of the coating layer and the base propellant, the content and layers of the coating on the combustion performance were investigated by Three-dimensional video microscopy, Scanning electron microscope, DSC and constant volume combustion test. The thickness of the double coated propellant was relatively uniform. The compatibility between coating layer and the propellant was good. When the coating content was 8%, the combustion enhancement value of the double-layer coated propellant was significantly higher than that of the single-layer coated propellant. The combustion enhancement value ΔL of the double-coated propellant increased at first and then decreased with the increasing of the outer coating layer. When the content of inner and outer coating layer was 5%, the progressive combustion was the largest, with ΔL of 0.1431 MPa^-1·s^-1, which increased by 43.53%, compared with the 37-well propellant.