Efficient and effective deployment of IEEE 802.16 networks to service an area of users with certain traffic demands is an important network planning problem. We resort to an evolutionary approach in order to yield good approximation solutions. In our method, novel genetic variation operations are proposed to incorporate the feature of this real-world application of evolutionary algorithm. Categories and Subject Descriptors I.2.8 [Artificial Intelligence]: Problem Solving, Control Methods, and Search - Heuristic Methods General Terms Algorithms, Design, Experimentation Keywords Network Planning, Combinatorial Optimization, Genetic Algorithm