Abstract: The shearing behaviour of recycled concrete beams is studied here, by putting forward the formula for calculating shearing strength of recycled concrete beams and then assessing their reliability therefore. Based on the comparison between the experimental data by domestic and overseas researchers and the calculated results by formula from the code for design of concrete structures (GB 50010-2010) (CDCS), the applicability of the CDCS for the recycled concrete beams is validated statistically. According to the analysis of factors affecting the shearing strength of beams, the feasibility of the CDCS for the recycled concrete beams bending capacity is examined. The reliability analysis of the recycled concrete beams shearing capacity is carried out by Monte Carlo method. It is shown that the formula from the CDCS is too conservative to calculate the shearing strength of recycled concrete beams as well as that of ordinary concrete beams. When the average compressive strength of the recycled concrete is increased to achieve the same standard compressive strength of recycled concrete as that of ordinary concrete, the reliability of recycled concrete beams is proved to meet the specification requirements.