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Employed the characteristic of OFDM in spectrum utilizing-rate highly, 8 bit depth gray scale image instead of simple binary image was embedded in gray carrier image. In OFDM, it is comparatively simpler by using QAM mapping for both embedding process and extracting process. Meanwhile QIM Algorithm proposed by Chen is improved and optimized by using the output of 4-QAM as the awaiting embedded information of QIM embedding algorithm, which enable QAM and QIM to combine organically. The Result show getting larger information hiding capacity and better effect.