Abstract: Based on absolute-rate theory, a new equation has been derived to correlate the binary liquid diffusion coefficient with concentration: where Cv = (FAAVBB/V)1/3, Cn = (). It has been applied to 16 systems with 176 experimental points. The grand average percent deviation in comparison with those obtained by using three other equations is as follows The results of calculation show that the equation proposed has higher generality and better applicability.