Can i watch tv through my epson projector?

Yes, if your projector has a video input. Connect your projector's composite video input jack (usually colored yellow) to your video source. You said you want to use it to watch TV, so you'll want to connect it to the video output of a video tuner (such as a digital TV converter box) or a VCR with a built-in tuner. Set your projector to the video input and you're good to go! If your only tuner is your television, you'll need to check your owner's manual to see if it has an "output" jack. Some do, some don't. If yes, you're in luck. If not, try one of the other sources I mentioned earlier. Good luck!