Boyd's interpolation theorem for quasilinear operators is generalized in this pa-per,which gives a generalization for both the Marcinkiewicz interpolation theorem and Boyd's interpolation theorem.By using this new interpolation theorem,we study the spherical fractional maximal functions and the fractional maximal commutators on rearrangement-invariant quasi-Banach function spaces.In particular,we obtain the mapping properties of the spherical fractional maximal functions and the fractional maximal commutators on generalized Lorentz spaces.