ENGINEERS TO DESIGN DISTRIBUTION NETWORK CAN DECIDE DIFFERENT ALTERNATIVE FOR EXAMPLE PLACEMENT AND CAPACITY NEED TO ANALYSIS LOCATION AND CAPACITY OF OTHER DISTRIBUTION SUBSTATION .SO DECISION AFFECT THE LOCATION NEIGHBOUR SUBSTATION .IN THIS CASE THE INPUT INFORMATION IS IMPORTANT AND CALCULATION IS IN DIRECT FAMILY WITH INFORMATION FOR EXAMPLE FOR SUBSTATION LOCATION YOU CAN SEE THE PAPER THAT LOADS ARE ASSUME CONSTANT THEREFORE MOST OF STUDIES BASE ON CONSTANT LOAD AND NORMALLY USE MAXIMUM OF LOAD CURVE TO DEFINE SUBSTATION SITUATION, ALTHOUGH MAXIMUM LOAD IS HAPPEN IN SHORT PERIOD AND LOAD CURVE IS DIFFERENT IN DAY SO THE OPTIMUM LOCATION FOR HOURS IS DIFFERENT .IN THIS STUDY TRY TO FIND THE LOAD POINT SITUATION ,ASSUME LOAD CURVE AND USE THE PROBABILITY METHODOLOGY.