Abstract: An LSP-DOA routing protocol was proposed， in which the DOA algorithm’s advantages in local routing repairing were inherited. In this protocol， the link stability was calculated based on the Two-Ray radio propagation model and Friis formula， and a threshold value was set. When the link stability was less than the threshold value， a warning would be triggered and the route discovery process was started in order to find out a new path to replace the link which might be interrupted. Simulation results showed that the LSP-DOA routing protocol could reduce control overhead and end-to-end delay， improve packet delivery ratio， route repair success and average route length， maintain a stable efficient route for a long time， thus improve the network performance by comparing with DOA， AODV and DSR.

Key words: ad hoc network, hierarchical routing, link stability, Two-Ray model, prediction