The swelling properties of remodeled swelling rock were carried out in the test section project of leading water from Yangtze to Huaihe River. By the test of free swelling ratio, swelling ratio under different pressure and saturated direct shear test, the properties of swelling ratio under different initial water content and different pressure were explored; the relationship between expansion ratio with initial expansion rate was analyzed. The conclusion show that initial expansion rate is quadratic positive correlated with expansion ratio, the strength parameters are negative correlated with expansion ratio.