  In this paper, we study the all genus Gromov-Witten theory for any GKM
orbifold $X$. We generalize the Givental formula which is studied in the smooth
case in \cite{Giv2} \cite{Giv3} \cite{Giv4} to the orbifold case. Specifically,
we recover the higher genus Gromov-Witten invariants of a GKM orbifold $X$ by
its genus zero data. When $X$ is toric, the genus zero Gromov-Witten invariants
of $X$ can be explicitly computed by the mirror theorem studied in \cite{CCIT}
and our main theorem gives a closed formula for the all genus Gromov-Witten
invariants of $X$. When $X$ is a toric Calabi-Yau 3-orbifold, our formula leads
to a proof of the Remodeling Conjecture in \cite{Fang-Liu-Zong3}.
