To cope with the emerging massive application of wireless sensor networks(WSNs) and its urgent attribute demands in low-energy consumption and high-security,a security and energy considering tree(SEC-Tree) topologized structure is proposed. Based on SEC-Tree,a multi-layer and multi-path routing protocol and a self-adaptation multi-path routing algorithm are presented. By applying pairwise shared key(PSK) in SEC-Tree initialization and route maintenance,a localized technology in encryptation and identificati...