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In wireless sensor networks (WSNs), some unavailable areas often formes because some sensor nodes become unavailable due to energy exhausted, congestion, or disaster. In this paper, we propose a new micro sensor multi-path routing protocol (MSMRP) to cross around the unavailable areas when building up the routes. And we design a neighbor node table exchanging mechanism that can avoid the multiple paths intersect when build a new route around the unavailable areas. Finally, we implement the proposed protocol in the real sensor nodes and set up a testbed to conduct experiments. The experimental results show that MSMRP can perform well to build up multiple paths to cross around the unavailable areas.