The accurate measurement of the opening level of capital account is the starting point and prerequisite for the relevant empirical research and the decision analysis. Capital account opening is a matter of the global systemic risk of China’s economy. From the point of view of law and facts, the paper sums up and compares the indexes of domestic and foreign measures of capital account opening, which is of positive significance to the correct judgment of the capital account opening situation, and to guide the capital account in the direction of economic development.