I have two email address.one is pop3,to receive my mail.another is exchange,to synchroniza my schedule and contactors.
Can i config these two mail address in my BB to receive my mail and synchroniza my schedule and contactors?Do i need BES?

I use both POP and Exchange (via the Desktop Redirector). You have a couple of options if you don't have BES. You can either use the Desktop Redirector or POP or OWA. The last two assume that your company provides access to Exchange via POP or OWA.

Your other email address gets setup separately from whatever you choose to use for Exchange.

if I create a BES,everything will be simple?

Yes and no. It depends on what you want to do. If you want to have to manage BES for 1 device, then go ahead. BES will give over the air sync of calendar and contacts too.

There are hosted services too (search on these forums and you'll find them).