The dynamic characteristics of semiconductor ring laser (SRL) with high bias current are numerically investigated, the bifurcation diagrams of different feedback coefficients, bias currents and delay time are displayed. The detailed process states demonstrate that the chaos paths with different parameters are different. The results show that the chaos generated by SRL with high bias current has broad bandwidth characteristic. The influences of parameters on the bandwidth of chaos are also studied. It is found that the widest bandwidth is about 18 GHz when the feedback coefficient is 0.5.