Once coverage holes appeared in wireless sensor networks（ WSNs）

performance of network will be severely affected. Aiming at this problem

"joint patch method "

a kind of coverage hole repairing algorithm based on mobile nodes is proposed. This algorithm "sews"all the needed mobile nodes into a large "cloth"

according to the sewing program

which is pre-established

and then repair the hole directly. Firstly

performance of the algorithm is proved theoretically

and then by using Matlab simulation; both of the number of nodes required and redundancy are compared with PATT algorithms; finally

stability of the algorithm is analyzed. Eventually

it shows that this algorithm has a higher coverage rate and lower redundancy.