Abstract: Based on absolute-rate theory, a new equation has been derived to correlate the binary liquid diffusion coefficient with concentration:D_(AB)=C_VC_η(D_(BA)~0)φ_A(D_(AB)~0)φ_Bβwhere C_V=(V_A~(φ_A)V_B~(φ_B)/V)~(1/3), C_η=(η_A~(φ_A)η_B~(φ_B)/η). 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 followsThe results of calculation show that the present equation proposed has higher generaliity and better applicability.