Based on the matrix algorithm proposed earlier by other researchers， a concise unified criterion for fault location in complex multi-source distribution networks is put forward， which can locate both the multiple fault and the end fault. As for the circumstances of incomplete or distorted FTU directed over-current information， solutions are given for each case. The first problem can be solved by ignoring the node with unknown information. When the fault information suffers aberrance， fault section alternates are located first based on the unified criterion for aberrance-free information location. The final fault area is selected thereafter in terms of the fault information sequence revision cost defined in the paper. Test results show that the approaches proposed are both correct and feasible， being capable of effectively resolving the fault location issues in the case of incomplete information or information aberrance. Hence their great potential for application in real-time fault location for distribution networks.