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With theoretical uncertainties, we find that $B\\to (\\pi, \\eta, \\eta')$ form factors at $q^2=0$ are $f^{(\\pi, \\eta, \\eta')}_{+}(0)=(0.245^{+0.000}_{-0.001}\\pm 0.011, 0.220 \\pm 0.009\\pm0.009, 0.180\\pm 0.008^{+0.008}_{-0.007})$ for vector current and $f^{(\\pi, \\eta, \\eta')}_{T}(0)=(0.239^{+0.002+0.020}_{-0.003-0.018}, 0.211\\pm 0.009^{+0.017}_{-0.015}, 0.173\\pm 0.007^{+0.014}_{-0.013})$ for tensor current, respectively. 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With theoretical uncertainties, we find that $B\\to (\\pi, \\eta, \\eta')$ form factors at $q^2=0$ are $f^{(\\pi, \\eta, \\eta')}_{+}(0)=(0.245^{+0.000}_{-0.001}\\pm 0.011, 0.220 \\pm 0.009\\pm0.009, 0.180\\pm 0.008^{+0.008}_{-0.007})$ for vector current and $f^{(\\pi, \\eta, \\eta')}_{T}(0)=(0.239^{+0.002+0.020}_{-0.003-0.018}, 0.211\\pm 0.009^{+0.017}_{-0.015}, 0.173\\pm 0.007^{+0.014}_{-0.013})$ for tensor current, respectively. 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