Although the study of physicochemical characterization of Urmia Lake confirms the salinity of lake is changing but this study has focused on the pattern of Weight-Frequency Percentage (%WF) form 1852 to 2008. Reanalysis of last data showed %WF hasn’t had homogenous structure of Weight-Frequency Percentage in Urmia Lake during the period 1852-2008 (Eimanifar and Mohebbi, 2007).