In order to solve the problem of service conflict in space division multiplexing elastic optical network nodes, full range spectrum converter(FRSC) and space selection switch(SSS) are configured in the dynamic function node structure to convert the spectrum of conflicting services. Based on this node structure, a spectrum conflict resolution algorithm based on spectrum concentration(SCRASC) is proposed. This algorithm comprehensively considers the used spectrum block ratio and the distance between the free frequency block spectrum and the largest spectrum block to optimize the frequency of the spectrum concentration. Simulation results show that the algorithm achieves better performance in terms of bandwidth blocking rate.