Abstract: Objective To study the cognition of mutual restriction beriveen foods and practice of diet arrangement among undergraduates and to explore the safety of some mutual restricted foods.Methods With random cluster sampling, 330 undergraduates were chosen from Lanzhou university and investigated with a self-designed questionnaire.Results The mean score on the cognition of mutual restriction between foods among the undergraduates was 7.72±1.23.No statistic difference was found in the scores between boys and girls(P> 0.05) and between students from diftferent areas Among the students 279 (84.55)agreed with the view of mutual restriction between foods; 241 (73.03%)believed that it was necessary to avoid eating the mutual restriciton foods at the same time; 273 (82.73%)thought of the view same times or occasionally; 82 (24.850)heard of death caused by eating the mutual restriction foods together No statistic difference was found in adverse reaction rate between mutual restriction foods and nounal foods While only 32 (9.7%)of the undergmduales felt uncomfortable after eating some mutual restriction foods Friends, relatives and books were the major resources for the undergraduates to learn about the mutual restriction food.Conclusion same daily mutual restriction foods are safe.Education on dietetic science and nutrition know ledge is needed.