Dispersion characteristics in a dense gas particle coaxial jet for different cross angles are experimentally investigated through high-speed photography. Because the cross angle creates the radial component of annular gas, a contraction of a granular jet from a central channel is observed. The minimum diameter and the contraction length of the granular jet decrease with increases of the annular gas velocity and the cross angle. A phase diagram of the dispersion modes for different cross angles is obtained. Moreover, the dispersion length of the granular jet is a function of the annular gas velocity, the particle mass flow rate, and the cross angle. The dispersion angle is highly nonmonotonic with the cross angle and the annular gas velocity. Finally, the radial component of annular gas enhances the perturbation of the granular stream and contributes to the particle dispersion of the granular jet.