The invention discloses a chemical shift imaging method and system. The method comprises the following steps: a) applying a magnetic field to a region of interest according to an imaging sequence, the imaging sequence comprising a plurality of radio-frequency pulses and a plurality of gradient pulses, wherein the radio-frequency pulses are excited continuously in sequence, and the gradient pulses comprise layer-selection gradient pulses and convergence gradient pulses, the last layer-selection gradient pulse being applied with one phase convergence gradient pulse, and the polarities of adjacent gradient pulses being opposite; b) collecting echo data through a series of gradient pulses with alternatively-opposite polarities by adopting a data reading mode of EPI; and c)carrying out data reconstruction to obtain a chemical shift image based on the echo data. Compared with a conventional chemical shift imaging CSI, according to the chemical shift imaging method and system in the technical scheme of the invention, the collection time is reduced to one order of magnitude, thereby helping to finish spectrum collection is a short time; and compared with echo planar spectrum imaging EPSI, 3-4 times of volume elements are collected under the same time and conditions.