Abstract
The present invention relates to a time synchronization method for wireless sensor networks, which is applied for the time synchronization of plural network nodes. It comprises the following steps: first, after a predetermined period, selecting a node from the plural network nodes as the reference node, and obtaining its time stamp; second, obtaining the time stamps of the other nodes except the reference node; third, calculating the practical time difference according to the time stamps of the reference node and the other nodes; and fourth, proceeding the synchronization of each node according to the time difference.