Owing to the randomness of crossover and mutation，when genetic algorithm（GA）is used to solve the reconfiguration problem of distribution systems，solutions that do not satisfy the system's topological constraints may be generated，and must be fixed.In order to generate a radial network，the basic circuit matrix is introduced to open and combine the loops dynamically.The method keeps the whole calculation from frequent topological search while improving its speed.In addition，a new heuristic rule refined from the one of optimal flow pattern（OFP）is adopted.And the entire reiteration is divided into two steps:searching for the optimal set of switches connected with the current convergence points（CPs）to open and the CPs'transfer.Calculation results show that the proposed algorithm has shortened the length of chromosome，reduced the population size，and improved computational efficiency.