Nowadays placement of distributed generation units (DGs) is carried out to achieve a variety of operational or planning goals. Minimizing the network losses , improving voltage profile , reliability and economic goals etc are among them .in this domain , analysis of DGs location effect on electricity nodal prices in distribution networks rarely has been considered. In this paper placement and sizing of DGs in a radial distribution network that operates under locational market pricing (LMP) rules, is carried out .some operational and economic goals in a variety of scenarios are tested on a practical distribution network. A binary particle swarm optimization (BPSO) algorithm is used to optimizing the multi-objective optimization problem.