Gonna have to part with some details, bud.
What are your stats? How long ya been doing this?
Quick answer = check the bench press setup thread. I added 40lbs on my bench just with form modification. Some may add even more weight, try it.
That's right... your first and number one thing to work on is to learn how to bench and not only properly bench but to bench for POWER! Doing so will usually add close to 50lbs or better on your bench. The average I've seen is about 40lbs.
I'll simply a few things that I have been playing with for awhile now...learn to use your legs..leg drive will save your ass and create more power through the movement...
grip the bar like you're trying to put your finger indentions into it. This will help stabilize you..
find the proper grip width for benching. Not everyone is the same. Experiment until you find a grip width that's the most comfortable...
FULL ROM! If you're not already doing that get the fuck out of here...
Do alot of benching with just the bar. Don't worry about what people think about it. Learn and engrain your benching bar path and groove into your being. That way when you're under heavier weight you do it without thinking.
Get a stronger back, triceps, and delts. Duh. The more overall stronger you get the stronger your bench will be. A stronger back and thicker back will help stabilizer your press and also make you thicker meaning you have less distance to go for your bench. Triceps as well... these are HUGE in the bench press. Work them hard and heavy and delts as well.
BENCH press more! I don't care what people tell you. Flyes, pec dec, dumbbells..whatever wont' give you a bigger bench. You want a bigger bench.. then bench. All that other shit is just there AFTER benching.
Bench twice a week... once day working on your speed i.e. Dynamic work..and one day doing HEAVY benching in the 90%-95% range for triples and doubles for no more than 3-6 sets after warmup.
EAT RIGHT!
...there's a shitload more but most of it we've all had to learn the hard way or have done alot of research and work to get there. That's all I'm giving you for now.