fractional integral operators play an important role in generalizations and extensions of various subjects of sciences and engineering. This research is the study of bounds of Riemann-Liouville fractional integrals via (h ,m)-convex functions. The author succeeded to , nd upper bounds of the sum of left and right fractional integrals for (h, m)-convex function as well as for functions which are deducible from aforementioned function (as comprise in Remark 1. 2). By using (h ,m)-convexity of jf′, j a modulus inequality is established for bounds of Riemann-Liouville fractional integrals. Moreover, a Hadamard type inequality is obtained by imposing an additional condition. Several special cases of the results of this research are identi, ed.