Abstract: A kind of multi-hop and synchronous time-division protocol for wireless sensor networks based on equipment monitoring of metallurgy industry was proposed. The protocol employs self-organized and hierarchical topology. Cluster headers structure backbone network to forward sensor data to the sink node. Nodes in cluster transmit data in a lower radio power to the cluster header by multi-hop and time-division, they reduce power loss and transmission delay by synchronous sleeping-scheme. Application in an equipment monitoring system of metallurgy industry indicates that this protocol has the characteristic of strong extension, reliable transmission, small signal delay, and low power loss.