The ELD (Economic load dispatch) is the one of the problem in distribution network. It is maintain the cost set the size of the distribution network. It is done by select the place for DG to maintain the power in distribution network. The power flow optimization is done by this process at very well to maintain power at better economic level. In our proposed the PSO based optimization will help to improve the quality output in optimal power flow analysis. That optimization will help to schedule maintain the power balance in distribution network. That simulation is done by MATLAB environment with standard bus IEEE bus system for measure the power flow and find the no of generation to maintain the power in the DG network. The simulation gives the information about the demand level in the distribution network by optimize the power flow it gives the information about generation placement for maintain the power quality. That generator cost and emission is calculated based generator power it help to optimize the cost and emission of the generator. In this process we calculate the cost and emission of the generator and also find the correct place to place generator for maintain the power in distribution network.