What should we prepare if we pianist will play with an orchestra?
And what should we aware if we are playing with orchestra besides right tempo of course, then?
Any suggestion appreciate as soon as possible. 
Sounds like you have a Concerto gig; congratulations!

1. Start practicing looking where the conductor will be, slightly to your left and up. Although you are the soloist, you will need to watch him at times. Also practice your solo part with all the rests now, and know the orchestral part and your entrances.
2. When you go to the first rehearsal the mass of sound that the orchestra makes may be disconcerting. Don't listen to them, stay focused on your own part or they will throw you off. Soon you will be able to play your part and have an ear tuned to them, and hopefully enjoy what they are doing.
3. If you haven't already have a meeting with the conductor so you can play your part and you can both discuss and hopefully agree on how you want it to go, so this doesn't happen....

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4. Do not directly address the members of the orchestra if you want something to be played a certain way, that is the conductor's turf, and to usurp him and intrude on it would be very rude, pushy and against established protocol.
Can't think of anything else at the moment...enjoy, and keep us posted!
