To　solve　the　route　security　issue　in　mobility　scenarios　and　especially　the　route　reconstruction　security　issue　after　the　network　topology　changes　in　wireless　sensor　networks,　an　immediate,　fast,　secure　and　energy-efficient　route　algorithm　were　proposed,　which　could　provide　new　nodes　or　mobile　nodes　with　the　immediate　and　efficient　data　transfer　paths　and　could　help　sensor　nodes　adapt　the　network　topology　changes　by　moving　the　sink　node　and　reconstructing　the　route.　Compared　with　other　secure　route　protocols　that　need　to　reconstruct　the　route　from　the　beginning,　this　algorithm　is　better　in　terms　of　communication　overhead　and　route　reconstructing　time.