The resistance and A.C. susceptibility measurements for SrRuO3 under a hydrostatic pressure were carried out. T(C) decreases linearly with an increase in applied pressure at a rate partial derivative T(C)/partial derivative P = -7.9 K.GPa-1 . T(C) decreases linearly with an increase in Ca content at a rate partial derivative T(C)/partial derivative x = -2.6x10(2) K. These phenomena were discussed on the nallow band model.