In china, 10KV distribution networks mostly adopt the neutral non-grounded way, and they have lots of branches. When the single phase grounding fault occurs, the fault current is flowing through the capacitance of conductors to earth, and the signal is too weak to be captured. In order to find the fault point quickly, a comprehensive method which combined C-type of traveling wave and decision tree is proposed. The first step of the method is using the advantages of C-traveling wave fault location method in distance measuring and the noise elimination function of Empirical Mode Decomposition（EMD） to determine the fault distance; The second one is finding the fault section by using the decision tree. By compared with the judging results of BP and RBF neural network, it shows that: the method based on decision tree can determine the single phase grounding fault point in 10KV distribution networks with branches accurately.