In this paper

the unstability and its effect factors of aqueous sodium hypochlorite solutiion were studied by the method of atomic matrix.It was shown that strong oxidisability of sodium hypochorite primarily depends on atom-oxygen[O] releasing from the decomposition reaction of sodium hypochlorite

and that the longer time passed

the more sodium hypochlorite can be decomposited.The reaction of sodium hypochlorite can be described as a quasi-one -order reaction in general appearance.Both temperature and concentration affect the stability of sodium hypochlorite in different degree.