We utilized controlled vertical drying deposition (CVDD) method,which can fabricate a uniform face-center-cubic (FCC) structure film,to investigate the crack formation and the size dependence of shear modulus in a drying particulate film.We found that both crack spacing and shear modulus depend on colloidal particle size.They drop with increase of particle radius (R) in a single range.Furthermore,compared with the shear modulus variation of a dry particulate film,it was found that both solid part and liquid part in a drying particulate film play equivalent roles in the film mechanical behavior. We utilized controlled vertical drying deposition (CVDD) method, which can fabricate a uniform face-center-cubic (FCC) structure film, to investigate the crack formation and the size dependence of shear modulus in a drying particulate film. spacing and shear modulus depend on colloidal particle size. they drop with increase of particle radius (R) in a single range. More than, compared with the shear modulus variation of a dry particulate film, it was found that both solid part and liquid part in a drying particulate film play equivalent roles in the film mechanical behavior.