Based on the Sellmeier equations of Kbe2BO3F2 (KBBF),non-collinear phase matching conditions and Newton-Raphson iterative approach,the type-Ⅰsecond harmonic phase-matching angle,effective nonlinear coefficient and the acceptance angle of KBBF crystal whose fundamental-wave wavelength is 1064 nm are respectively calculated with numerical method,under the non-collinear phase matching. The results show that the non-collinear phase matching can be realized when the angle of the first fundamental-wave angle is 20°-85°. Accordingly the angle of the second fundamental-wave the double-frequency wave is 29.1°-52.7°and 24.6°-68.83° respectively. The effective nonlinear coefficient decreases and the acceptance angle increases as the first fundamental-wave angle grows. When the first fundamental-wave angle is 26.1°-26.8°,both of them have an oscillation phenomenon.