In this paper the properties of the polymer modified cement mortar are studied of didy formwork concrete surface coated layer for protection . the emphasis is focused on the permeability and cracking - proof feature 本文主要对模网混凝土聚合物改性水泥砂浆保护层的性能进行研究,着重探讨了与耐久性密切相关的抗裂性能和抗渗性能。