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Based on density functional theory, we study the intrinsic anomalous Hall conductivity (AHC) of monolayer (ML) CrI 3 in different magnetic configurations. We find that ML CrI 3 in both the in-plane and off-plane ferromagnetic (FM) states hosts significant AHC, with quantum plateaus occurring at topologically nontrivial bandgaps. In the in-plane FM state, the AHC of ML CrI 3 depends sensitively on the magnetization direction. First, the sign of AHC can be inverted whenever the magnetization angle increases by 60 °. Second, the AHC vanishes if the magnetization angle is equal to the odd times of 30 °. By doping electrons and applying moderate strain, one can switch the magnetic ground state between the off- and in-plane FM states and manipulate the magnitude and sign of the AHC. Based on these features of AHC of ML CrI 3 , we propose a theoretical model to realize the functions of spintronic devices such as the reversible spin transport, magnetic sensors, or magnetic read-in head. [ABSTRACT FROM AUTHOR]