Wireless sensor network is similar to both the wired network and the wireless network. In general, computers are connected together and become a network. These computers are equipped with city power so that equipments of every computer can run as faster as it can and do what it needs. In contrast, wireless sensor network consists of wireless sensors equipped with the limited battery power. With both the limited battery power and the unattended place wireless sensors deployed, the entire lifetime of ad-hoc wireless sensor network needs to be extended. Therefore, to extend an entire network lifetime is an important issue. An optimal cluster number selection and forwarding station were proposed to extend the network lifetime. In addition, combing these two proposed methods is supposed to extend the entire network lifetime.