Abstract: To screen excellent dilution,boar semen was diluted and preserved in three common dilutions and one self-prepared dilution.The semen preserved in the self-prepared dilution was used for mating.Sperm motility was determined by 10-score assessment method,and effective survival time,overall survival time and survival index were calculated.The results showed that the self-prepared dilution had better preservative effect on sperm than Kiew solution,glucose-sodium citrate solution and glucose solution.The results of the mating experiment showed that the sows artificially inseminated with the semen preserved in the self-prepared dilution had conception rate and litter size which reached the requirements of production.Therefore,the self-prepared dilution can be used in production.