Vehicle exhaust，dust and grease in tunnels are hard to be degraded，thus there will be more and more pollutants and the traffic safety will be influenced. Therefore，regularly cleaning tunnels is important for guaranteeing the traffic safety in tunnels. A tunnel cleaning method with dry ice is proposed，and a model of dry ice cleaning tunnel is developed based on the physical，chemical and cleaning properties of dry ice. Some experiments about the surface hole，surface temperature and the uniaxial compressive strength of the concrete are conducted. The surface damage and the compressive strength of the concrete is researched after the cleaning process. The test results show that：the dry ice cleaning method can thoroughly clean the surface of concrete；the surface damage and the compressive strength is little influence by the temperature and dry ice micro blasting. So dry ice cleaning method can be used for cleaning tunnel.
