As a new type of D-FACTS equipment,DSSC can be utilized to eliminate the transmission network congestion.In order to study the cost allocation of DSSC after installed,a cost allocation method based on electrical dissection method is proposed.Responsibility factors of generators and loads are determined quantitatively by the results of electrical dissection,and the cost of the DSSC is distributed to each generator and load according to the congestion responsibility factor respectively.Finally,the simulation results based on the IEEE 39-bus system show that the proposed method can recover the DSSC equipment cost from the generator and load effectively and fairly.