Dear　Editor,
In　this　letter,a　vision-based　fixed-time　control　is　proposed　for　an　unmanned　aerial　vehicle(UAV)with　actuator　saturation　to　track　an　uncooperative　target.The　fixed-time　control　is　designed　in　backstep-ping　framework.The　relative　states　between　UAV　and　the　target　are　not　directly　measured,and　are　estimated　by　an　onboard　monocular　camera.It　is　proved　that,the　closed　loop　UAV　with　actuator　satura-tion　is　capable　of　reaching　the　target　before　a　fixed　time.The　fixed　time　can　be　estimated,and　it　is　independent　of　initial　states.