The invention provides a method for calculating the sensitivity of branch breakage which is derived from a direct current method and in which high-order terms are reserved. The method is based on a direct-current flow model. A calculation method which is simple and convenient and higher in accuracy of a calculated result is provided on the basis of analysis of the conventional direct current method for solving the sensitivity. In the method, the high-order terms are reserved by fully utilizing status information before and after breakage in solving of the sensitivity, and calculated amount is not increased in calculation process; moreover, because the high-order terms are not removed, an error only comes from the direct-current flow model, so that calculation accuracy is improved. Due to simple, convenient and high-accuracy calculation, the method can be widely applied to all application fields of network analysis of a power system, such as the fields of simulation, analysis and calculation of an energy management system (EMS), a dispatcher training system (DTS) and the power system, and the method has a good promotion application value.