When the curing temperature of roller compacted asphalt concrete is lower than the specification requirements of 70℃, the paper carried out compaction experiment. Through monitoring the temperature above and under combination surface, it carried out shear test of fixed shear surface of 45 degree. The result showes that when the lower curing temperature is at the circumstance of -10℃ and 30℃, the temperature of joint surface is higher than that of softening point of asphalt and combines well by pouring out compaction; the shear stress of joint surface can reach 50%~60% of ontology, and shear deformation and loading process have obvious plastic feature.