Abstract: To timely eliminate the bad impact on users by Single-phase break of the 110 kV load line, Complex sequence networks analysis method based on positive sequence, negative sequence and zero sequence and the corresponding scheduling strategy is proposed in this paper. Firstly, take A phase break line as an example to carry on the basic theory derivation analysis, and then respectively for 110 kV load line single-phase disconnection in different conditions are analyzed. Finally, the corresponding scheduling strategy is proposed according to the analysis results and the field scheduling rules. The analysis results show that the phase voltage of the broken line is related to whether the two sides of the fracture are grounded or not; When the load side ungrounded system occurs single-phase break and the two sides of the break are ungrounded, the phase voltage of the break phase is half of the normal voltage. If combined bus is used, zero sequence current will be generated and its magnitude is proportional to the load current. Therefore, it may cause the zero sequence protection action of the double circuit on the power side, and skip the double circuit. When single-phase line break occurs, the dispatcher on duty should choose the right way to reduce the influence of the fault according to the voltage and current.