http://www.vimeo.com/27107627
can any one give me some suggestion on how to change my form?
First. You're putting yourself into a speed-drill and then wondering why your form is suffering. Any time you do a shooting speed-drill by yourself (no rebounder) your form is going to suffer. When shooting a layup you want to explode and run through the layup. You're changing your body movements in the air because you're landing from your jump and immediately turning to rebound your ball. If you are just running through it and not worrying about the rebound it will look slightly different.
Second. And most importantly. Definitely
stop shooting right handed on the left-hand side. You're setting yourself up to be a shot blockers dream. Sure, it can help you scoop it up and under occasionally. But you're moving the ball a good 2 feet closer to your defender...there's no way to read that other than making it easier to get yourself blocked.
Third. Slam that last dribble. Powering that last dribble down before your two steps is just another way to key your body into an explosive movement. Watch most NBA players on fast breaks. Their last dribble is typically more controlled and more powerful than the ones leading up to it. They want that ball to stick to their hands as they go up. That definitely helps it.
Fourth. After you dribble, do not bring the ball across your body. It's natural for your arms to want to swing the ball across your body as you take your last two steps and leap. But all you're doing it bringing right to your defenders hands. Any decent defender and a competitive level can strip that ball without blinking or thinking twice. (Example: Watch your last layup. You take your dribble with your right hand...then you grab it with both hands and carry it immediately to your left hip. Then you carry it back across and shoot the layup.) When that ball is at your left hip, I will steal it. I won't even say thank you. I'll probably even ask your sister out, take her to a nice dinner, have a great time and never call her again. It will be that easy.
It's what I call wasted motion. What's the point of taking the ball across your body? A good layup isn't about height. It's about space between you and your defender and knowing what angle you should shoot and using the backboard. It's developing a soft touch with plenty of arch. There's no reason Steve Nash should be able to shoot a layup in the NBA w/ 7footers between him and the basket...but he's mastered those angles and a soft touch. So he does work on those big oafs.
Fifth. I know Adarq said it is slow. And it kind of is, but focus on removing that excess wasted motion, then work on speed. Slow it down more if you have to. Protect that ball and focus on that soft touch. Your speed will increase as your strength and athleticism increase from working out. If you don't protect the ball and get that soft touch though, what good will it do you? You could be the biggest, strongest, fastest brick layer ever!