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Network Mobility (NEMO) is being concerned as a new mobility issue. Many NEMO issues have received much attention in research community where route optimization is a most important one. With NEMO Basic Support Protocol (NBS), all the communications to and from a node in a mobile network must go through the bi-directional tunnel established between mobile router and its home agent, which may bring redundant route. In this paper, we propose a hierarchical route optimization scheme in mobile network (HROS) to solve mobility management and route optimization problems. HROS uses MAP which is a mobility management technique in HMIPv6 to construct a hierarchical architecture, a detailed route optimization scheme is designed under this architecture to eliminate pinball routing within mobile network.