Statistical　inferences　under　simple　stochastic　ordering　for　two　continuous　populations　has　a　long　and　rich　history.　But　further　study　for　multiple　populations　is　still　expected.　In　this　article,　we　consider　samples　test　for　simple　stochastic　ordering　against　unrestricted　alternative.　A　test　statistic　is　constructed　with　the　empirical　distribution　functions　and　the　isotonic　regression　estimates　of　distribution　functions,　and　the　null　asymptotic　distribution　of　the　proposed　test　statistic　is　given.　A　bootstrap　procedure　is　suggested　for　the　critical　values,　and　some　simulation　results　are　presented　to　illustrate　the　proposed　test　method.