Bidet, water supply and drainage system with spray washing, glazed ceramic sanitary equipment for washing human excretory organs. According to the spraying method of washing water, it is divided into direct spraying, oblique spraying and front and rear cross spraying. Glazed porcelain with water absorption ≤ 0.5% and glazed ceramic bidet with 8.0% ≤ water absorption ≤ 15.0%, which are made of clay or other inorganic substances by kneading, molding and firing at high temperature.