The invention provides a method for analyzing the influence of the line impedance and the call wire power on a generalized short-circuit ratio. At present, no clear analysis is conducted for the influence of the impedance angle of a circuit and the power of a DC call wire on the generalized short-circuit ratio. According to the technical scheme of the invention, based on the definition of the generalized short-circuit ratio, the line impedance and the call wire power are taken into consideration during the deriving process. Meanwhile, the simulation analysis is conducted for analyzing the influence of the line impedance and the call wire power on the generalized short-circuit ratio. When the influence of the line impedance on the critical short-circuit ratio is analyzed, the fact that the Thevenin equivalent impedance of a multi-infeed direct current system contains an imaginary part is taken into consideration. During the calculating process of the generalized short-circuit ratio, Z is taken as |Z|, wherein the impedance angle is delta and delta is larger than or equal to 70 degrees and smaller than or equal to 90 degrees. After that, appropriate network topology parameters are selected, so that GSCR=2 when the system is at a rated power. The limited injection power and the current of the system are calculated through the simulation calculation process. The analysis of the invention shows that, the system boundary and the critical generalized short-circuit ratio will be decreased when the line impedance and the call wire power are considered, and the change ratio of the data value is within 5%. Therefore, the generalized short-circuit ratio can still be used for differentiating the intensity of the AC power grid.