The temperature dependence of the magnetic susceptibility and the high-field magnetization up to 55T are measured for URu 2 Si 2 under high pressures up to 1GPa. Both T χ m a x and T N in the susceptibility increase with increasing pressure. The value of the susceptibility below T χ m a x decreases with increasing pressure. The three high-field metamagnetic transitions at H c 1 =35.1T, H c 2 =36.5T and H c 3 =39.6T at ambient pressure, show different pressure-dependent behaviors. The metamagnetic transition at H c 1 broadens but survives and its transition field increases with increasing pressure. However, the transition at H c 2 is smeared out and disappears above 0.4GPa. The transition at H c 3 broadens more clearly than the transition at H c 1 . The fact that both T χ m a x and the metamagnetic transition fields increase suggests that the interaction between the f-electrons and the conduction electrons is enhanced by pressure.