Abstract: During construction,the trass cement 300 # were poured in partial blocks in Xin’anjiang Dam,so,it is the weakest part in the concrete of dam body.According to the comments of first periodic inspection,the dam face poured with the trass concrete300 # were re-quired to be carried out protection face treatment.It was adopted wet-guniting acrylate latex mortar technique in construction.The prac-tice proved to be successful and effective.It is simple to operate,speedy to construct and economic as well,particularly suitable to anti-seepage and anti-erosion protective facing with great dimension and thin layer.