How to effectively reduce the generation of infeasible solutions in distribution network reconstruction is an important step to improve the search speed. To improve search efficiency, on the basis of simplification of the network topology,an pretreatment method based on loop matrix block-recombination strategy is presented which could compress and resolve the solution space. Combined with this strategy，simulation is performed in Cuckoo Search method and its improved method on IEEE33 node system 119 node system and the results show the analytical method based on loop matrix block-recombination can effectively avoid the generation of infeasible solutions. The algorithm only searches within a few feasible ranges so the search area is reduced.And the algorithm is faster and is of greater success rate of solving, then the validity of the proposed model is verified. Finally, this strategy is applied to a variety of intelligent algorithms. The results show that this strategy can significantly improve the performance of the algorithm then the applicability of the proposed strategy is verified.