This research aims to figure out the enterprises' evaluations towards the ISO 14000 environments management system before and after they lead in the ISO 14000 series. The authors expect to provide their findings for other companies' reference. The results showed that before the manufacturers carry out ISO 14000, they expected to promote their reputation and market share most, while this expectation fell back to be ranked as the eighth after they implement this system. None of these manufacturers reached the satisfaction indication of 4 points. Only the item of environmental protection obtains better satisfaction. The significant differences were found in the items of expecting benefit between before and after implementing ISO 14000 as well as in the item of benefit intensity. Besides, among the eight variables of manufactures' background, only some of them showed significant differences.