ESR experiments on Cs3-xKxC60 and Cs3-xRbxC60 (x=0.5 to 3) are carried out. Two absorption lines with nearly the same g factor and the different linewidth are observed, both of which show the properties of conduction electron spins on C60 in high temperature region. The existence of two metallic phases is proposed in the alkali-metal-doped C60.