Objective In order to understand whether the sanitary condition of the large，medium and small catering business in Taiyuan can meet the requirements of laws and regulations，the focus was put on the weakness points and emphasizing on supervision. Method Stratified random sampling method was used to investigate the sanitary management， sanitary institutions and the conditions of dish-washing and disinfecting of 56 catering businesses in Yingze district of Taiyuan city. Results The findings showed that the sanitary managing conditions was better in large catering businesses than those in medium and small catering businesses; the rate of equipping sanitary facilities in large catering businesses， medium businesses and small businesses were 100% ，54. 5% to 90. 9% and 40. 4% to 75. 0% respectively; and the qualified rate of food and drinking utensils in large，medium and small catering businesses were 95. 2% ，77. 3% and 56. 7% respectively. Conclusion It was shown that the rate of equipping sanitary facilities and the qualified rate of food and drinking utensils were gradually lower according to the sizes of business. The legal operation departments in charge of supervision should put the emphasis on the medium and small catering businesses.