A micro-holographic interferometer of two-wavelength lasers has been designed and constructed. The concentration profiles close to the interface of 1iquid side were successfully measured for multicomponent gas-liquid mass transfer. It was discovered that the measured concentration at fldistance 0.0lmm away from the interface was far from the thermodynamic equilibrium value, and thus flsteep concentration gradient existed near the interface. The turbulent phenomena near the interface during interphase mass transfer were noted by experiment. The turbulent intensity and time were related to the composition and the components of the system to be studied, and also affected by the velocity of each phase. The concentration field near fronta1 interface was different from that of tai1-vortex area for the mass transfer around a bubble.