Controllable　locomotion　enables　micron/nanorobots　to　voyage　and　perform　microsurgeries　inside　the　human　body.　With　the　assistance　of　micro/nanorobots,　medical　tasks　can　be　fulfilled　more　efficiently　than　traditional　treatment　approaches.　The　micro/nanorobots　have　performed　various　tasks　that　would　not　be　possible　by　conventional　methods.　Moreover,　wireless　propelling　methods　bring　about　a　lot　of　benefits,　so　that　the　biomedical　field　gains　a　new　development　opportunity.　Because　of　the　continuous　efforts　made　by　researchers　in　the　past　decade,　tremendous　achievements　have　been　obtained　for　micro/nanorobots　working　in　vivo.　Inside　the　human　body,　the　micro/nanorobots　hold　great　potential　for　various　applications　including　cancer　therapy,　sensing,　gene　silencing　and　thrombolysis.　In　this　paper,　we　provide　an　overview　on　recent　wireless　micro&nanorobots　applied　in　cells,　blood　vessels,　tissue　and　eyes.　Actuation　methods,　including　acoustic,　magnetic,　light,　chemical　and　bioenergy,　for　micro&nanorobots　insidethe　human　body　are　summarized　and　specific　applications　of　them　are　also　discussed.　Furthermore,　challenges　such　as　speed,　biocompatibility,　controllability　still　exist.　However,　we　can　also　foresee　promising　developments　in　future.　Multifunction,　simplified　devices　and　intelligence　will　be　the　forthcoming　development　directions　for　in　body　micro&nanorobots.