In this paper,we have given several equivalent characterizations of the concept of fuzzy subgroup,established the axiom system for fuzzy subgroup,and gotten five minimum complete axiom systems.Furthermore,we also have discussed on fuzzy group based on cancellation law,gotten the minimal complete system for fuzzy finite group and fuzzy periodic group,and obtained an equivalent characterization of general fuzzy group,according to which corollaries fuzzy periodic group,fuzzy torsion-free group and fuzzy mixed ...