This document discusses multipath routing strategies in wireless sensor networks. It begins with an introduction to multipath routing and its advantages over single path routing such as improved reliability and load balancing. It then reviews several existing multipath routing protocols that aim to improve reliability, energy efficiency, security, throughput and load balancing. Some protocols find multiple disjoint paths to distribute data segments for fault tolerance while others adopt congestion control or balanced tree structures for load balancing. The document concludes that multipath routing effectively addresses the limitations of single path routing.