The study investigates the electrical control of magnetism in bilayer CrI3, a two-dimensional (2D) magnet. The researchers demonstrate that electrostatic gating can be used to switch between antiferromagnetic (AFM) and ferromagnetic (FM) states in CrI3 bilayers, as probed by magneto-optical Kerr effect (MOKE) microscopy. At fixed magnetic fields near the metamagnetic transition, voltage-controlled switching between AFM and FM states is achieved. At zero magnetic field, the system exhibits two time-reversal pairs of AFM states with spin-layer locking, leading to a linear dependence of MOKE signals on gate voltage with opposite slopes. This work paves the way for exploring new magnetoelectric phenomena and van der Waals spintronics based on 2D materials. The findings highlight the potential of 2D magnets for developing electrically coupled spintronic devices with low operation energy.The study investigates the electrical control of magnetism in bilayer CrI3, a two-dimensional (2D) magnet. The researchers demonstrate that electrostatic gating can be used to switch between antiferromagnetic (AFM) and ferromagnetic (FM) states in CrI3 bilayers, as probed by magneto-optical Kerr effect (MOKE) microscopy. At fixed magnetic fields near the metamagnetic transition, voltage-controlled switching between AFM and FM states is achieved. At zero magnetic field, the system exhibits two time-reversal pairs of AFM states with spin-layer locking, leading to a linear dependence of MOKE signals on gate voltage with opposite slopes. This work paves the way for exploring new magnetoelectric phenomena and van der Waals spintronics based on 2D materials. The findings highlight the potential of 2D magnets for developing electrically coupled spintronic devices with low operation energy.