The action mechanism of operator of real-coded genetic algorithms(RCGA) was analyzed.The characteristics of local searching of cross operators was deduced.Directionality of mutation operator was defined.Direction of mutation was not uniform and its direction distribution was dominating at coordinate orientation.Special function optimiaztion problems with separable variables were defined and the peculiarity was analyzed.It is concluded that RCGA is appropriate for sloving function optimiaztion problems with ...