A large aperture and high quality Ca4YO(BO3)3(YCOB) crystal was successfully grown using the Czochralski method.The dimension of the as-grown YCOB crystal was up to φ 110 × 90 mm3,which was the largest size to our knowledge.No cracks are apparent in the as-grown crystal.The crack and spiral growth can be effectively controlled in the as-grown crystal。The crystal plate with dimension of 80 mm × 80 mm × 15 mm was harvested from the as-grown crystal for further experiment.