The purpose of this experiment was to study the effects of different crushing particle size combination of corn and soybean meal on the processing quality of broiler feed and growth performance of broilers. The corn in the test diet was pulverized by using three sieve apertures of 2.0, 2.5 and 3.0 mm, respectively. And the soybean meal was crushed by using three sieve apertures of 1.5, 2.0 and 2.5 mm, respectively. The two groups of corn and soybean meal were combined into 9 different crushing particle size treatment combination, and processed and modulated by the same diet formula and granulation parameters. A total of 900 broilers of 22-day-old were randomly divided into 9 groups, and 9 diets with different particle size combination were used for each group, 5 repetitions for each group and 20 chickens for each repetition. The broiler feeding experiment lasted for 21 d. The results showed as follows:1) the particle durability index and particle hardness of the pellets treated with 3.0 mm sieve for corn and 1.5 mm sieve for soybean meal were the largest, while the particle durability index and particle hardness of the pellets treated with 2.5 mm sieve for corn and 1.5 mm sieve for soybean meal were the smallest. 2) Both corn and soybean meal were treated with a 2.5 mm sieve aperture crushing treatment, the average final weight and average daily gain of broilers were the highest, and the feed to gain ratio was the lowest. 3) The crushing particle sizes of corn and soybean meal and the interaction between the two had no significant effects on the apparent digestibility of crude protein, energy and dry matter, the eviscerated yield, and the relative weight of muscular stomach and glandular stomach of broilers (P>0.05). It is concluded that the corn and soybean meal in the 22 to 42 days old broiler diets are both crushed by the 2.5 mm sieve, when the geometric average particle sizes of corn and soybean meal are 348.38 and 450.46 μm respectively, the growth performance of broilers is the best.