The presence of price disparity between A- and H- shares suggests that the two markets are segmented and thus allocation of capital is inefficient. In this paper, we attempt to identify the factors contributing to the price disparity, with a view to helping policymakers find solutions to the problem. Our results suggest that the disparity is caused by a combination of micro and macro factors. The fact that some of these factors are found to have played a crucial role in determining the disparity implies that reforms that can remove or reduce the segmentation can potentially bring considerable benefits by improving price discovery and market efficiency.