By globally analyzing all existing measured branching fractions and partial rates in different four momentum transfer-squared $$q^2$$ q 2 bins of $$D\rightarrow Ke^+\nu _e$$ D → K e + ν e decays, we obtain the product of the form factor and magnitude of Cabibbo–Kobayashi–Maskawa matrix element $$V_{cs}$$ V c s to be $$f_+^K(0)|V_{cs}|=0.717\pm 0.004$$ f + K ( 0 ) | V c s | = 0.717 ± 0.004 . With this product, we determine the $$D\rightarrow K$$ D → K semileptonic form factor $$f_+^K(0)=0.737\pm 0.004\pm 0.000$$ f + K ( 0 ) = 0.737 ± 0.004 ± 0.000 in conjunction with the value of $$|V_{cs}|$$ | V c s | determined from the standard model global fit. Alternately, with the product together with the input of the form factor $$f_+^K(0)$$ f + K ( 0 ) calculated in lattice quantum chromodynamics (LQCD) recently, we extract $$|V_{cs}|^{D\rightarrow Ke^+\nu _e}=0.962\pm 0.005\pm 0.014$$ | V c s | D → K e + ν e = 0.962 ± 0.005 ± 0.014 , where the error is still dominated by the uncertainty of the form factor calculated in LQCD. Combining the $$|V_{cs}|^{D_s^+\rightarrow \ell ^+\nu _\ell }=1.012\pm 0.015\pm 0.009$$ | V c s | D s + → ℓ + ν ℓ = 1.012 ± 0.015 ± 0.009 extracted from all existing measurements of $$D^+_s\rightarrow \ell ^+\nu _\ell $$ D s + → ℓ + ν ℓ decays and $$|V_{cs}|^{D\rightarrow Ke^+\nu _e}=0.962\pm 0.005\pm 0.014$$ | V c s | D → K e + ν e = 0.962 ± 0.005 ± 0.014 together, we find the most precisely determined $$|V_{cs}|$$ | V c s | to be $$|V_{cs}|=0.983\pm 0.011$$ | V c s | = 0.983 ± 0.011 , which improves the accuracy of the PDG’2014 value $$|V_{cs}|^\mathrm{PDG'2014}=0.986\pm 0.016$$ | V c s | PDG ′ 2014 = 0.986 ± 0.016 by $$45\,\%$$ 45 % .