Abstract: If two spanning trees with the sink node as root make the paths from any given source node on the two trees to the sink node are node disjoint, they will be termed as Node Disjoint (ND) trees. Aiming at the requirements and features of industrial wireless sensor networks, this paper studies the routing schemes based on ND trees. Analysis and simulation show that the proposed routing scheme can achieve higher reliability and lower packet delivery delay. Besides, a scheme to deploy two node connected networks is also presented.