The preduster applies a mixture of flour and breading accurately and evenly when the products pass the belt, to meet the requirement of the next processing step. Using air flow system to collect  leak flour, leak flour is reused.And it can be combined to the battering machine and breading machine to make different production lines for the different processing:predusting-battering-predusting,battering-predusting,battering-predusting-breading and etc.