A method and system for finding a source failure node in a traceable network. The method includes: determining a possible source failure node according to a leaf node that has an exception, wherein the possible source failure node is a node that is most likely to cause the exception; selecting a target node to receive an investigation result corresponding to the target node, wherein the investigation result indicates whether the target node has the same exception; receiving the investigation result corresponding to the target node and updating the traceable network according to the investigation result; and returning to the step of determining a possible source failure node, if it can not be verified according to the updated traceable network that the possible source failure node is the source failure node causing the exception.