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A routing algorithm (fuzzy dynamic routing protocol, FDRP) based on fuzzy logic-based was proposed for mobile ad hoc networks (MANET). It is applied to manage routing policies and to enhance routing performance dynamically. The parameters in MANET were classified with fuzzy degree of membership. The different parameter values were selected according to the different networks environments. The algorithm was integrated to AODV protocol and simulated by NS2. The FDRP algorithm was compared with standard AODV algorithm. The results of the simulation showed that the performance of the FDRP algorithm proposed the paper were noticeably improved. So, it is feasible that the fuzzy logic algorithm is applied to optimize routing performance of MANET.