Erosion of soil is one of the processes that threaten the resources of water and soil in a country. The process of erosion is very complicated and different factors are involved in it. The most important factors are regional factors, ground's steepness, plants covering, managing and way of using the lands. Because of not having information in region, among experimental factors, why methods BLM, FAO, EPM, MPSIAC were selected and evaluation of these 4 methods where done in one district of Kohgiloyeh & Boyerahmad province (district of Qal'e bani). Among 4 methods mentioned, the first 2 methods of erosion and deposit estimate quantitatively and 2 other methods of erosion estimate qualitatively. According to MPSIAC's method, yearly district of erosion's degree was obtained 3.59 ton in hectare in each year, and in EPM's method this amount was 2.76 ton in each hectare. In BLM, FAO's method, the last records were calculated in accordance to erosion for all districts by average they are sequentially 47.9 and 55.9.On the basis of this, in FAO's method, degree of erosion is placed in fourth class which needs a huge and wide change in handling the lands and limited the building operation. The consequence shows the differences between amounts in mentioned methods. On the basis of this we can say the difference of consequences in MPSIAC, EPM method is caused by inherent contrast in estimating of erosion in methods. In according to seen contrast in BLM, FAO's methods, the quantity of the parameters and scoring can be considered the reasons of these contrasts. The performed studying and fulfillments shows that the EPM's method presents the consequences that are nearer to reality and can be used in similar districts.