With the continuous development of smart grid, we begin to study multi-objective transmission network planning. And the design of the plan must ensure its reliability, flexibility, adaptability, economy, destruction resistance. In order to work out a suitable scheme, we establish a new multi-objective transmission network planning model, which is based on a cosine ordering theory. In order to obtain anoptimal comprehensive scheme, this paper will also make a comparison, in order to guide the multi-target transmission network can be better planning.