Marotto chaos in a discrete Lotka-Volterra predator-prey system has been investigated in this paper. A theoretical analysis has been made of the conditions under which Marotto chaos exists with numerical simulations conducted on the bifurcation diagrams, maximum Lyapunov exponents (ML), fractal dimensions (FD), and phase portraits, thus verifying the validity of the theoretical analysis, and displaying the complex dynamical behaviors of this system as well. Combined with the existing conclusions, a more complete understanding of the dynamical behaviors of this system will be obtained for subsequent researchers.