In order to reduce the bandwidth blocking rate and the consumption of spectrum resources in dynamic networks, the path conditions of different service requests may be different. Therefore, it is impossible to determine the advantages and disadvantages of single-path dedicated protection and partitioning dedicated path protection. In this paper, a Hybrid Dedicated Path Protection (HDPP) routing spectrum allocation strategy is proposed by combining single-path dedicated protection and partitioning dedicated path protection. This strategy considers the distance adaptive modulation and the number of path hops pre-calculated k link disjoint candidate paths. We also propose a Multiple Path Spectrum Assignment (MPSA) strategy that considers the highest spectrum efficiency per unit frequency slot with the number of path hops and the maximum available spectrum information on the path. HDPP selects the best scheme among multiple survivability routing spectrum allocation schemes. The simulation results show that the proposed algorithm has better performance in terms of blocking rate and spectrum utilization compared with other algorithms.