The loop-opening and loop-closing operation can avoid outage when switching power supply, thereby improving the reliability of distribution network. In order to ensure the safety of loop-closing operation as well as the economy and power quality after loop-opening, an optimal control strategy is proposed by considering the whole process of loop-closing and loop-opening operation in this paper. Compensation capacitors, transformer taps and distributed generation are utilized as control means. Meanwhile, the control target is set to minimize the times of device regulation before loop-closing and after loop-opening, the maximum load rate during loop-closing, the network loss and voltage deviation after loop-opening. Secondly, the historical load of distribution transformer is adopted to calculate the load power of distribution network, which improves the accuracy and real-time of power flow calculation. In addition, the multi-objective particle swarm optimization algorithm is applied to obtain the Pareto optimal set of control schemes. Finally, a practical example in different scenarios are included to verify the effectiveness of the proposed control strategy.