Abstract: In view of the shortcomings of the data processing of the combined Atterberg Limits test results, the least square method and the analytical method based on the Origin commercial software are proposed to process the test data. The silty clay samples in Kaifeng are used for the data verification. The results show that the two methods can quickly draw graphs and automatically extract the 17 mm liquid limit, the 10 mm liquid limit and the plastic limit. For the Origin least square method, the derived Adj.R-Square value of 0.9785 can quickly determine whether the test data is acceptable. It is not necessary to calculate the difference between the corresponding two water contents at the cone penetrating depth of 2 mm, which has the advantages in batch processing of test data. Compared with the mathematical analytic method, Excel and AutoCAD software, the Origin analytic method is simpler and faster, with clear process, which is easy to be popularized and applied in the commercial laboratory tests.

Key words: Origin, Least Square Method, Analytical Method, Atterberg Limits, Level Crossing