提出了波分复用(WDM)网络中基于优先级策略的资源预约机制，旨在解决WDM网络中多任务请求同时到达的资源预约问题。该算法不仅提出双向资源预约机制，提高资源预约效率；而且，提出基于马尔可夫预约模型来计算各个任务请求的最小使用波长概率，确定各任务请求的可用资源因子；最后，结合任务请求本身特性提出总负荷因子，采用串行与并行相结合的方式，设定多任务请求资源预约优先级与波长选择模型。通过分析与仿真验证表明，相较传统预约算法，该算法对于多任务请求的资源预约效率与资源利用率的提高有很好的效果。

The priority based source and destination initial reservation protocol (PSDIRP) is put forward in wavelength division multiplexing, which is aimed at solving the optical resource reservation for multiple connection requests arriving at the same time. The source-destination initialized reservation protocol is proposed to improve the reservation efficiency. The least utilization rate of wavelengths by the Markov model to determine the available resource factors of multiple requests is got. The algorithm sets the priority and the wavelength assignment model combining with the connection requests′ characteristics, such as total load factor (TLF), through the way of combination of serial control and parallel control. From the simulation, it is can concluded that the algorithm has a better performance in the increase of the resource reservation ratio and the optical network resource utilization rate comparing with the traditional algorithms.