Abstract: Abstract: In the production process of straw with particles feed for mutton lamb fattening, due to the problems of low productivity, poor quality of forming particles and high energy consumption caused by improper operation parameters, the processing technique of straw with particles feed for mutton lamb fattening was investigated with the wheat straw and corn as the main experimental raw material. And concentrate-forage ratio of raw material, water content of material and feeding rate were as the experimental factors, and the particles density, molding rate, pulverization rate, the productivity of pure working hours and the energy consumption per ton of products were as experimental indices. In this article all single-factor experiments of each factor in orthogonal experiment were treated as studying emphasis, through which the factors indicating actual manufacturing conditions were recognized, and based on that the orthogonal experiment was performed and more accurate systematic experiment results were obtained. By means of single factor experiment on the influence of material water content, concentrate-forage ratio of raw material and feeding speed on the molding effect of particles feed, on the basis of the particles density, molding rate and pulverization rate to meet the industry standard, the suitable range of each factor was determined. When material water content was 16% in single-factor experiment, density of pellets feed would be 1 255.27 kg/m3, which was out of scope (900-1200 kg/m3) of industry standard SC/T 6020-2002 specified for pellets manufactured by ring-die pellets mill without steaming intervention process. When water content was 22% and 24%, pulverization rate would be at 14.60% and 13.58% respectively, which both surpassed scope (≤13%) of pulverization rate specified for pellets manufactured by ring-die pellet mill without steaming intervention process. So experiments with water content of 13.58%, 14%, 16%, 22% and 24% were eliminated. Besides, pulverization rate varied greatly under concentrate-forage ratio between 8:2 and 6:4, and reached 19.35% at concentrate-forage ratio of 8:2, which surpassed pulverization rate scope (≤13%) specified in industry standard SC/T 6020-2002 for pellets manufactured by ring-die pellets mill without steaming intervention process, so experiment with concentrate-forage ratio of 8:2 was also eliminated. Whereas, in experiment, along with accelerating speed of feeding, density of pellet decreased gradually, and variation ranges of molding rate and pulverization rate were high at feeding speed of 600 r/min. Pulverization rate at feeding speed of 600 r/min was 15.98%, which surpassed scope (≤13%) specified in industrial standard SC/T 6020-2002 for pellets manufactured by ring-die pellets mill without steaming intervention process, so experiment with feeding speed of 600 r/min was eliminated too. By using the method of orthogonal test and extreme difference method, variance method and comprehensive balance method, on the experiment analysis of significance, primary and secondary order of the impact of 3 factors on the indicators, the optimal parameter combination for the processing technique of straw with particles feed for mutton lamb fattening was determined. Experimental results show that when the concentrate-forage ratio of raw material was 4:6, the water content of material was 17%, and the feeding speed was 500 r/min, the particles density was 1116.48 kg/m3, the moulding rate was 99.51%, the pulverization rate was 7.36%, the pure working hour productivity reached 716 kg/h, the particles density conformed to the national standard requirements, the molding rate and pure working hour productivity reached the highest, and the pulverization rate fully met the national standard requirements although it was not the lowest. The optimal production conditions obtained through orthogonal experiment were in line with the actual production conditions. The experiment results provide reference data for the production and processing of straw with particles feed for mutton lamb fattening.