One important issue when designing Wireless Sensor Network (WSN) is the routing protocol that makes the best use of the severely limited resource presented by WSN, especially the energy limitation. Another import factor required attention from researchers is providing as much security to the application as possible. In this paper, we propose a new routing protocol called SEER: Secure and Energy- Efficient multipath Routing protocol. SEER uses multipath alternately as the path for communicating between two nodes thus prolong the lifetime of the network. On the other hand, SEER is effectively resistive to some specific attacks that have the character of pulling all traffic through the malicious nodes by advertising an attractive route to the destination. The performance of our protocol is compared to the Directed Diffusion protocol. Simulation results show that our protocol surpasses the Directed Diffusion protocol in terms of throughput, control overhead and network lifetime.