Based on Peleg's equation,used linear regression analysis,the slope K2 and the constant K1 in the formula was calculated. Furthermore,the moisture content value and the percentage deviation modulus E between data was determinated and predicted by experiment,which could be used to judge the degree of fitting.The new water absorption equation of common paddy,high moisture content paddy and brown rice was established. Upon test,the moisture content value and the percentage deviation modulus E were less than 10%. The new soaking water absorption e...