Objective To design a half-net type feeding box and evaluate the feasibility of this feeding mode for rodents.Methods To modify and improve R5 box into a half-net type box,and to compare rats feeding results between the common feeding type and half-net type.The workload of changing box and animal production ability were calculated.According to the methods of GB14925-2001,the ammonia concentration inside the boxes of common feeding type and half-net type was measured and analyzed.Results 1) Using the half-net type feeding the bedding usage and workload were reduced by 50% and 75%,respectively,in comparison with those by common box feeding method.2) No difference was observed between the two feeding types in regard to rat production capacity.3) No significant difference in ammonia concentration of the two feeding types was observed during the first 4 days after changing the box,but after 5th day,the ammonia concentration inside half-net type boxes was lower than that in common feeding boxes.Conclusion Compared with routine feeding type boxes, there are apparent advantages of the half-net type feeding boxes,which can well satisfy the feeding needs and obtain the same feeding results,while considerably reduce bedding usage and workload.