Soil disturbance has long been a significant challenge in the engineering field,particularly when it comes to evaluating the degree of soil disturbance and the quality of samples taken by soil sampling equipment.These situations are more difficult problems in engineering practice.Due to numerous factors that contribute to soil disturbance,traditional disturbance evaluation indices fail to adequately reflect the effects of human-induced disturbance,factors that contribute to soil disturbance are analyzed in this paper,and the unavoidable unloading disturbance is separated from the overall disturbance evaluation.A theoretical formula for unloading disturbance is proposed and validated through multiple sampling tests with different soil samplers.Finally,an improved method for evaluating soil disturbance is presented,and can better evaluate the technical level of soil sampling.