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This paper presents entrainment mechanism,and transported and diffusion characteristics at the point of entry of submerged jet. The profiles of both velocity and concentration within the air-water mixing layer were theoretically deduced. And the comparisons between theoretical values and measured data were made. Results show that the velocity profile within the air-water mixing layer exhibits a form of error function. The concentrations of air entrainment in the intal and extal regions of air-water mixing layer correspond to Gaussian distribution.