  We study the Gromov-Witten theory of $K_{\mathsf{P}^1\times\mathsf{P}^1}$ and
some Calabi-Yau hypersurface in toric variety. We give a direct geometric proof
of the holomorphic anomaly euqation for $K_{\mathsf{P}^1\times\mathsf{P}^1}$ in
the form predicted by B-model physics. We also calculate the closed formula of
genus one quasimap invariants of Calabi-Yau hypersurface in
$\mathsf{P}^{m-1}\times\mathsf{P}^{n-1}$ after restricting second K\"ahler
parameter to zero. By wall-crossing theorem between Gromov-Witten and quasimap
invariants, we can obtain the genus one Gromov-Witten invariants.

Algebraic Geometry