Bird System

How to play Bird System (1.f4)? Is there any tip? Is the concept differ from KG?

Well obviously, since 1.e4 e5 2.f4 (King's gambit I take?) sacrifices a pawn. Now 1.f4 does not allow black to play e5 without giving up a pawn. (The From, which is playable by the way.)

However, the ''normal'' way to play it is 1.f4 d5 2.Nf3 Nf6 3.d3 (for example) Then white will attempt to press on e4 at some point, setting up the ideal e4/f4 centre, but with backup from the d3 pawn. You can also say it is a Dutch defence upside down. There are many ways to play it, such as the reversed Stonewall, (f4 and d4, not intending e4 at all) the reversed classical, (d3 and e3 and later you play e4) and the reversed Leningrad (d3 and g3 and Bg2, with the idea to play the e2 pawn to e4 in one go) 

There's no easy way to answer your question, if you want to talk about a specific variation, feel free.

can you tell me how to use Bird system but a way that i can prevent opponent from attacking my Knight on f3 and Bishop or Queen on h4? you know both squares are fatal blow.

I don't understand the question. Many people are worried about Bg4, because black can break with e5, for example. However these variations are ok and give white the bishop's pair. Now the idea Bg4, Bxf3 and Qh4 or something seems far fetched to me, and it is no threat at all. You can quite simply block the check with g3, and again you have the bishop's pair. I hope that answers it, otherwise please give the exact variation.

http://www.chess.com/groups/home/birds-opening-lovers

Join this group.  It is a very strong group on chess.com that focuses on 1. f4.  We have lots of vote chess games with lots of discussion.  

I will give you some pointers - I play lots of 1. f4. 

To answer your question, first you must understand a couple of basics about the squares you mentioned.  I will post a few moves with discussion.