Environment physical parameters which reflect energy efficiency status of building can be monitored with wireless sensor networks（ WSNs） with mobile node. Aiming at non-continuous features of monitoring area in space and time

sweep coverage in WSNs is presented. To plan routing for each mobile node in sweep coverage

resultant forces potential field based moving strategy in sweep coverage is given too. And from the perspective of potential field construction

describes the moving strategy from the point of view of mobile nodes to find the target interest point and from the point of view of interest to find a suitable mobile node. Related experiments are carried out

and the results are compared.