Theory of anticipated possibility is the imputation base of normative liability theory. A legal proverb goes that: the law does not impose. Because of Unzumutbarkeit,the responsibility should be eased or exempted. The standards which are used to evaluate the normale Beschaffenheit der begleitenden Umstande，contrainte morale and excusable should be average person adding certain person. Cited into the theory of anticipated possibility, the written law which contain the connotation of anticipated possibility will limite the judge's power of discretion but have enough sympathy.