In mobile ad hoc networks (MANETs), the provision of quality of service (QoS) guarantees is much more challenging than in wire line networks, mainly due to node mobility, multi hop communications, contention for channel access, and a lack of central coordination. The difficulties in the provision of such guarantees have limited the usefulness of MANETs. In the last decade, much research attention has focused on providing QoS assurances in MANET protocols. In this paper we have analysed different types of routing protocols and QoS metrics in MANETS. Trust based AODV (TAODV) routing protocol modify the effect of AODV routing protocol. In TAODV is preferred to achieve best result in terms of end-to-end delay, energy packet delivery ratio and throughput.