This disclosure provides an method for reconstructing a multi-channel magnetic resonance image (MRI), comprising: measuring k-space data at each channel of a multi-channel MRI system coil array; reinforcing the consistency of the k-space data to suppress the noise in the k-space data by a linear relationship among the k-space data at different channels; and reconstructing a magnetic resonance image by the multi-channel k-space data wherein the consistency of the k-space data is reinforced.