This paper deals with new results on Gruss inequality by using recent fractional integral operators. In fact, based on the (k, s, h) -- Riemann-Liouville and the (k, h) --Hadamard fractional operators, we establish several integral results. For our results, some very recent results on the paper: [A Gruss type inequality for two weighted functions. J. Math. Computer Sci., 2018.] can be deduced as some special cases.