Comparison has been made among three soil classification systems,i.e.genetic system,numesical system and taxonomic system.Through classification of 71 profiles.Results obtained has shown the following points:1.Owing different bases and criteria according to which the soils are classifical,the differences among the three systems occur mainly in categories of soil order and great soil group.The diagnostic characteristics which the three systems are based on are substantially not fully agree with soil forming stages and allitization intensity.