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We study time decay estimates of the fourth-order Schr\"{o}dinger operator$H=(-\Delta)^{2}+V(x)$ in $\mathbb{R}^{d}$ for $d=3$ and $d\geq5$. We analyzethe low energy and high energy behaviour of resolvent $R(H; z)$, and thenderive the Jensen-Kato dispersion decay estimate and local decay estimate for$e^{-itH}P_{ac}$ under suitable spectrum assumptions of $H$. Based onJensen-Kato decay estimate and local decay estimate, we obtain the$L^1\rightarrow L^{\infty}$ estimate of $e^{-itH}P_{ac}$ in $3$-dimension byGinibre argument, and also establish the endpoint global Strichartz estimatesof $e^{-itH}P_{ac}$ for $d\geq5$. Furthermore, using the local decay estimateand the Georgescu-Larenas-Soffer conjugate operator method, we prove theJensen-Kato type decay estimates for some functions of $H$.

Decay Estimates and Strichartz Estimates of Fourth-order Schr\"{o}dinger Operator