RVA(Rapid visco-analyzer) can be used to detect the visco of malting barley to predict the sprout damage of malting barley according to the characteristic.However,there are no uniform EBC or ASBC standards of this method up to now.Moisture,varieties specificity,smash size and so on can affect the results of this method.In the study we created a method of RVA,and analyze the effects of these factors to RVA,The results showed that the initial mass and smash size of barley are two significant factor to the RVA value of barley,while the effects of moisture is less important.The level of sprout damage of malting barley had a remarkable correlation with RVA.We can use this fast,sensitive and convenient method to predict the sprout damages of malting barley.