Deception jamming poses a fatal threat to the radar performance. Distributed multi-radar fusion system is an important development trend of radar deception ECCM. However, its construction conditions are harsh. It is of great importance to improve the deception ECCM ability of monostatic radar. This letter applies the RIS to monostatic radar, constructing a virtual multi-radar detection channels combined with the multi-beam receiving technology. Then, the data fusion-based deception ECCM method for multi-radar system is used to improve the anti-jamming ability of monostatic radar. Simulation results corroborate the deception ECCM ability of the proposed RIS aided virtual multi-radar system.