Abstract: In this paper a rotation and PEGASIS-based energy-efficient chain routing protocol is proposed to reduce energy consumption in wireless sensor nodes and prolong the life span of wireless sensor networks (WSNs). The proposed protocol is an improved protocol of geographical adaptive fidelity (GAF) protocol based on (power-efficient gathering in sensor information system, PEGASIS) chain protocol. Simulation results demonstrate that the proposed protocol has better performance in energy conservation than traditional routing protocols, such as PEGASIS, LEACH and EEPB. Moreover, more uniform distribution of the wireless sensor nodes could be realized when more than a half of the sensor nodes died.