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In this paper, we obtain the existence and uniqueness theorem of$L^{p}$-solution for coupled forward-backward stochastic differential equationsdriven by G-Brownian motion (G-FBSDEs) with arbitrary $T$ under weakly couplingcondition. Specially, the result for $p\in(1,2)$ is completely different fromthe one for $p\geq2$. Furthermore, by considering the dual linear FBSDE under asuitable reference probability, we establish the comparison theorem forG-FBSDEs under weakly coupling condition.

Forward-backward stochastic differential equations driven by G-Brownian motion under weakly coupling condition