Abstract: The construction waste reclaimed sand is produced by the same quality of plate waste and column waste which are crushed and screened. The membrane agent is prepared by mixing dihydrate gypsum, powder, cellulose ethers and other raw materials, and membrane treatment of construction waste reclaimed sand is carried out, which is produced for cement mortar of CL and CLT. The influence of dihydrate gypsum, powder, cellulose ethers on performance of different blocks is studied by the method of orthogonal level analysis and variance analysis. The results show that the best membrane of the compressive strength ratio is 4% gypsum, 2% powder, 0.6% cellulose and 4% gypsum, 3% powder, 0.2% cellulose respectively. The best membrane of the flexural strength ratio is 4% gypsum, 1% powder and 0.2% cellulose ethers. Three factors have little effects on its absorption. However, the absorption rate of CLT block is less than the CL block.