This paper estimates methods of measuring rill erosion amount. It is admitted that volume method is simple, convenient and suitable to use in the feild, but its precision is lower. In order to improve its precision,the paper puts forward the method of choosing Yang and method of measuring and calculating estimated the rill erosion amount used the volume method in the field. By analysing data, the paper has further given linear equation calculaling precise value according to the measuring value of the volume method. The author considers that measuring and calculating the rill erosion amount used the method raised in this paper in the field is convenient and obtains precise value.