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Generally,the differences in structure and energy of crystal polymorph exhibit different narrow band structures,electron-phonon coupling,optoelectronic characteristics and charge transport properties,thus leading to different device performances of organic semiconductors for application in organic field-effect transistors(OFETs).Untill now it still remains a big challenge to control organic crystal polymorph because the slight non-directional intermolecular interactions lead to the very small differences instructure and energy of cystal phases with several alternative packing arrangements.Therefore,the control of the crystal polymorphism towards high device performance has become a crucial issue in the field of organic semiconductors.