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In this research, we investigate the mechanical behaviour of zinc sodium phosphate glass system with the various concentration of chromium oxide doped. The glass system was synthesized using the melt quenching technique. The concentration of chromium oxide varying from 0.5% to 2.5%. Longitudinal and shear ultrasonic velocities were measured in different compositions of the glass system at temperature range between 270 K and 323 K. From the transit time data and density, we found that all the mechanical behaviour for these glasses decrease as the Cr2O3 content increase, which indicates a weakening of the binding energy in the network.