Abstract: Static loading test was used for inspecting the quality of soil improvement using stone column method usually before. But the result of static loading test is only represented the improvement quality of the topsoil and the top of stone column, because the influence depth of loading test is limited. A new method for inspecting the quality of the stone column is described in the paper. The new method includes combination and comparison of CPT test and static loading test. The quality of the stone column in total improvement depth can be determined accurately by the new method,and it has been demonstrated as a good,effective and simple inspecting method by its application for many years.