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Introduction of the Cl-anion in the borate systems generates a new perovskite-like phase, K3B6O10Cl, which exhibits a large second harmonic response about four times that of KH2PO4 (KDP) and is transparent from the deep UV (180 nm) to middle-IR region.A high quality single crystal of K3B6O10Cl with dimensions up to 25 × 11 × 7 mm3 was successfully grown by the top-seeded solution growth method for the first time.Morphology analysis reveals that the growth of crystal is anisotropic.By the minimum deviation technique, the refractive indices of the crystal were measured and fitted to the Sellmeier equations [1].The limit of type-Ⅰ phase matching second harmonic generation wavelength was calculated to be 255 nm.The thermal properties and laser damage threshold have been investigated.The measurements show that the K3B6O10Cl crystals have a high damage threshold.