Soil sedimentation and stress history have great impact on the determination of soil gravity stress and the final settlement of the foundation soil. Due to the accurate and convenient of coordinate in dealing with the linear problem over coordinate, thus it is often applied to calculate the influence of sedimentation and gravity stress of the normal consolidated soil and over-consolidated soil. This formula is to used to calculate the gravity stress value and final settlement value of deep soft clay which came from Kunming exhibition Center near Dianchi Lake, while the calculation result is used to make a comparison with historical data of stress value and settlement impact. The result showed that the sedimentation has great impact to the gravity and final settlement value of deep soft clay, furthermore, the thicker of the soil will bring the bigger of the overlying load consistently.