[lycier]

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I don't know why 3♣ is called as a bard bid with invitational hand,who can tell me ? and how to do next?

[steve2005]

I guess 2♣ is new minor forcing so 3♣ is 5+♣ but not forcing only INV
I think you should pass 3♣ as are a minimum

[chasetb]

A bar bid is a pre-emptive bid made in order to keep the opponents from entering the auction, usually by balancing. One sequence that some people use is 1-2-3 bar, when you open one of a suit, partner makes a weak raise, and you again raise it to the 3-level, but to play.

Honestly, you should have passed 3♣ - partner knows you have 11-14 balanced and decided it wanted to find a possible 4-4 fit on the way.

[1eyedjack]

To complete the picture, as I understand it, with a game try or better GIB responds 2C on first round (1D-2C being not GF). That leaves this sequence otherwise redundant, except as an opportunity for weak canape