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The glutinous rice-lime mortar (M_GRL) is a high performance organic-inorganic composite, which has been commonly used as a building material since ancient times in China.However, the knowledge of nonlinear structure of M_GRL is limited.In this work, the nonlinear structure of traditional M_GRL was investigated.The particle size distribution (PSD) of fine and micro-aggregate were evaluated by fuzzy fractal set.The microstructure of M_GRL were tested by electron backscattered diffraction (EBSD) and field emission scanning electron microscope (FESEM) analysis.Results shown that the structure of M_GRL is a fuzzy fractal system.And the fuzzy fractal dimension of the system is correlated to the fracture resistance of M GRL.