In wireless network communication mobile communication has becomes very significant. MANET is a temporary network that means nodes transfer without any fixed infrastructure. In MANET changes the network topologies due to nodes are movable and also nodes are commonly communicated with each other over various wireless links. In MANET routing is a problem because there is no router between source and destination so mobile nodes also themselves act as the routers. In MANET, routing based on the topologies, router source. Congestion control is a major problem in MANET. Congestion means when transmit the number of packets across the network is larger than the capacity of the network then network becomes congested. Due to congestion the packets have to be deleted and also reduce the performance of the network. To finding the congestion free shortest path is a main issue in MANET.