Abstract:Chizhou Miaoy tower was built in the 29th year of Wanli of the Ming Dynasty (1601) and completed in the 40th year of Wanli (1612). It took 11years, 410 years ago. The total height of the tower is 55.7m, and the perimeter of the bottom layer is 37.6m. Miaoyin tower is a green brick structure building.Due to the long construction age and the influence of natural and human factors, Miaoyin tower is facing various severe diseases such as green brick weathering, surface collapse, biological influence and so on. Aiming at the main diseases of Miaoyin tower, this paper analyzes the constituent factors of the diseases, and puts forward the countermeasures of protection, so as to achieve the purpose of scientific protection.