Abstract: In general, soil test datum arrangement process of highway engineering is difficult to use a single drawing tool making the double logarithmic graph reach satisfactory results. Excel has excellent data processing and statistical functions, but its graphics effect is not regular and beautiful; Compared with Excel, AutoCAD has fast and accurate mapping and editing features, but its data processing capability is poor. Making full use of their respective advantages handle soil test in the double logarithmic graph is a very convenient and practical method.