A Mobile Ad-Hoc NETwork (MANET) is a wireless network, collection of mobile nodes that are dynamically and arbitrarily positioned in such a way that the contact among each other. These nodes do not make a fixed configuration since the nodes can go in any direction. These MANET nodes can converse along with other nodes in the radio range. In the existing system, Genetic Algorithm (GA) and Ad hoc On-Demand Distance Vector (AODV) routing approaches are introduced for energy efficiency. However these methods have issue with best Cluster Head (CH) node selection in larger network. Thus the overall performance is reduced significantly. To avoid the above mentioned drawbacks, in the proposed system, Modified Particle Swarm Optimization (MPSO) and Dynamic Source Routing (DSR) protocol is proposed. The proposed method contains three phases such as system model, CH selection using MPSO and routing. In the system model, nodes are connected to send and receive the packets. Energy model and mobility model are constructed to give efficient packet transmission over MANET. In second phase, the MPSO algorithm is focused to select the best CH node using fitness function. It is used to calculate the energy utilization through distance among nodes. In the third phase, the DSR protocol is used to produce efficient routing path over MANET. Thus the simulation results conclude that the proposed MPSO+DSR algorithm is better than the existing GA and AODV in terms of lower energy consumption, higher throughput, lower end to end delay, higher packet delivery ratio and higher network lifetime Keywords: MANET, Genetic Algorithm (GA), Cluster Head (CH), Modified Particle Swarm Optimization (MPSO), Dynamic Source Routing (DSR) and routing path I. INTRODUCTION MANETs is an infrastructure-less, active system encloses a set of wireless movable nodes that communicate along with each other without the use of any centralized authority. Every node in a MANET is without charge to move freely in any route, and hence modify its links to other nodes often [1] [2]. In a MANET, every node has its own radio broadcast range. Two nodes can have communiqué with every other openly only if they are in the similar radio communication series. If two hubs are not in the similar radio transmission range, they can still transmit but using the intermediate nodes. Every time the nodes in the MANET are concerned in transmission, battery energy of those nodes will get reduced. The issue of power utilization in MANETs can be identified in various levels. Recently, several researchers aimed on the optimization of power efficiency of mobile nodes, from diverse of viewpoint. The goal of power responsive routing method is to decrease power consumption in packets broadcast among a source and a destination, to prevent packets routing via nodes with low residual energy. It is used to optimize flooding of routing data on the given system and to neglect interfering and intermediate conflicts. Power resourceful routing algorithms achieved via creating proper routing approaches that...