Construction problems of interior wall tiles, reasons for discoloration of tiles: poor quality of tiles. Treatment method: During construction, the glazed tiles shall be clean, soaked for at least 2 hours, and the bonding thickness shall be controlled within 7-10 mm, and shall not be too thick or too thin. When pasting, the face brick and the bottom layer shall be pasted tightly, which can be knocked gently with a wooden hammer. When hollowing occurs, the wall tiles shall be removed, the original bonding mortar shall be removed, and the cement mortar with 3% of the total volume of qualified glue shall be used for repair. The problem is that the joints are not straight, because the specifications of bricks are different or the joints exceed the allowable error. Treatment method: face tiles shall be carefully selected during construction, and those of the same size shall be grouped together for one wall.