  We propose a mass-dependent MOM scheme to renormalize UV divergence of
unpolarized PDFs at one-loop order. This approach which is based on a once
subtracted dispersion relation does not need any regulator. The overall
counterterms are obtained from the imaginary part of large transverse momentum
region in loop integrals. The mass-dependent characteristic of the scheme
yields to mass-dependent splitting functions for the DGLAP evolution equations.
While the flavor number is fixed at any renormalization scale, the decoupling
theorem is automatically imposed by the mass-dependent splitting functions. The
required symmetries are also automatically respected by our prescription.
