Capacitated Arc Routing Problem (CARP) is one of the hot issues of logistics research. Specifically, Ranking First Cutting Second (RFCS) could be used. This research proposed a novel partitioning algorithm - the Multi-Label algorithm which obtained better TSP paths meeting the backpack limit on the basis of a complete TSP return. In addition, by experimental verification on questions in the standard question database, the experimental results showed that compared with general partitioning algorithms, for the same complete TSP return, many TSP paths with the shortest total length could be obtained by the Multi-Label algorithm.