To compare the effects of different medium-effect dilution powders on the quality of boar semen stored at normal temperature,9 kinds of medium-effect dilution powders were selected,including 3 kinds of domestic and 6 kinds of foreign products,numbered as A,B,C,D,E,F,G,H and I,respectively.Boar semen from 12 Duroc was used for normal temperature preservation by measuring the pH value,motility,effective preservation time,deformity rate,acrosome integrity rate and plasma membrane integrity rate during the effective period of sperm motility.The results showed that the sperm motility of diluted powder E was significantly higher than that of diluted powder C,D,F and G after storage for 3 days (P<0.05).The semen diluted with diluted powder E and I had the longest effective storage time,reaching 10.91 d and 10.33 d,significantly higher than the other 6 (P <0.05).The deformities of diluted powder D,E,G and H were lower,and the deformities of diluted powder D and E were significantly lower than the other 4 (P <0.05).The sperm acrosome integrity rate of diluted powder A was always the highest after the 2nd day,which was significantly higher than that of diluted powder C,D and F (P <0.05).The sperm membrane integrity rate of diluted powder E and H was significantly higher than that of diluted powder D and F (P <0.05).Taken together,when boar semen diluted with 9 kinds of medium-effect dilution powders was stored at room temperature,the qualified rate reached 88.89% of the national standard and product standard.Among them,dilution powder E,H and I have the best effect.The evaluation of diluent powder’s influence on boar semen quality should include several indexes.