To realize the recycling use of crop straws,artificial diets were fermented by mixing crop straw powder with wheat bran and used for mass rearing of house flies, Musca domestica (Diptera:Muscidae).The results showed that the efficiency of converting corn straw into dietary requirements by M. domestica was the best,followed by wheat straw and rice straw.The content of crude protein and crude fat of corn straw in artificial diets significantly decreased after insect feeding.Similar effect were found in the contents of soluble sugar,starch,crude protein and crude fat in the artificial wheat straw diet.The best diet for mass rearing of the house fly was the fermented corn or wheat straws mixed with wheet bran at the proportion 1∶1 each.For the feeding assays,200 mg of M. domestica newhyhatched larvas was supplied with 250 g of diet.