Estimating the target parameter while the prior distribution function is known‎, ‎and several observations which are provided by the sensor node is the main goal in this paper‎. ‎In wireless sensor networks (WSN)‎, ‎nodes sense the environment and send data to a sink node called Fusion Center (FC)‎. ‎FC collects data and estimates the observed parameter with user-defined precision‎. ‎The proposed algorithm increases network lifetime and has an efficient estimation process‎. ‎For this purpose‎, ‎the proposed algorithm schedules node’s activity and determines the multihop path between nodes and FC‎. ‎Simulation and performance analysis demonstrates proposed algorithm fulfills its goals.