Abstract: In this paper, based on Jumarie’s modified Riemann-Liouville (R-L) fractional calculus, we find the solution of some type of improper fractional integral. Change of variable for fractional calculus, integration by parts for fractional calculus, fractional L’Hospital’s rule, and a new multiplication of fractional analytic functions play important roles in this article. In fact, our result is a generalization of the traditional calculus result. Keywords: Jumarie’s modified R-L fractional calculus, improper fractional integral, change of variable, integration by parts, fractional L’Hospital’s rule, new multiplication, fractional analytic functions. Title: Evaluating an Improper Fractional Integral Based on Jumarie’s Modified Riema...