All current localization algorithm study focuses on how to improve the positioning accuracy, but rarely studys how to arrange node. Just randomly selecting anchor nodes meet the conditions, however, the algorithm does not explicitly request how to arranged anchor node, so you want to get the appropriate anchor node at all times can only randomly arranged a large number of anchor nodes. However, a large number of increasing the number of anchor nodes is bound to greatly increase the cost of the system and in the actual operation of the arranged is unrealistic. Based on the above issue, this paper proposes a distribution optimization algorithm basis on RGM algorithm. Algorithm detailed analysis of the coverage area of each set of positioning unit, positioning accuracy meets the conditions for the basis to calculate the coordinates of each anchor node. Simulation results show that according to the algorithm arranging anchor nodes does not reduce the positioning accuracy.