Objective To select a full\|nutrient diet for laboratory animals which has good quality as well as lower price through comparing the grouth effect on Wistar rats from different diets produced in Beijing.Methods Wistar rat A,B and C from different units were divided into 4 groups fed with 4 kinds of full\|nutrient diets a,b,c and d.By weighting each rat and the diet in each cage every week the increased weight of 4 groups of rats and the day\|average consumption of 4 diets in each cluster were compared.Results The average increased weight of 4 groups in the same cluster of Wistar rats were no significant difference (P>0.05),but the day\|average consumption of 4 diets was different.Conclusion there is no significant difference between the 4 diets produced in different companies for the growing Wistar rats of the 4 groups in same cluster. The day\|avergae consumption of diet d is the highest,and that of diet c is the lowest.