Capacity is one of the key properties for the QoS（Quality of Service） support in Mobile Ad hoc Networks（MANET）.In this paper,based on the characteristics of wireless channel and link throughput in MANET,a strategy space for node flow distribution and a flow utility function based on network flow rate and delay are constructed based on the network flow theory,the coloring theory and the non-cooperative program game theory.Then,a capacity analysis model of MANET is proposed based on shared channel in a normalized time slot,and the exis-tence of its Nash equilibrium solution is proved,followed by the presentation of an idiographic form.Numerical simulation indicates that the proposed model is universal and is effective in analyzing the MANET capacity.