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In city transit planning, line network optimization is a good measure with low cost and high efficiency. The researches on line network optimization are important in all cities. The optimization method for public traffic line network is studied according to the feature of line network optimization and adjustment problem. The cluster indexes for bus network in traffic region and for bus line are established respectively. This paper proposes analyzing and evaluating the feature of the bus network and bus line by using cluster analysis method, which lays a foundation of the adjustment and optimization of bus network and bus line. The principle and method of optimization and adjustment of line network are proposed and applied successfully in practice.