Fang Yizhi was of great attainments in Yi-ology.He synthesized many theories of philosophical connotations and Image-number.He devoted himself to research and established his own theory on profound Yi-ology.Fang thought the book of Changes root in Prenatal Yi-ology.He interpreted the theory of Heluo five elements and prenatal eight diagrams and explained Yi by philosophical connotations and Image-number.His thought of Yi-ology was communicated with “philosophy of equaliza-tion”.The form of Fang Yizhi’s Yi-ology had many relationship with his personal experience and family traditional literature.%方以智在易学方面有很深的造诣。他融贯象数、义理诸家之说，鼎薪炮药，创一家之说，形成内容十分丰富的易学观。方以智以先天易学为《周易》之根源，对河洛中五说和先天图说进行了阐释，在解易方法上主张义理与象数兼用，方以智易学思想与“均的哲学”相通。方以智易学观的形成与其人生经历及家学渊源有很大关系。
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