Abstract: A cup-jet absorber is one of the high velocity co-current equipment of mass transfer. Research on this equipment in related literatures was only restricted to the operation conditions below the liquid-gas ratio m = 8 1/m3, while works on the liquid-gas ratio m=101/m3 have not been found yet in the periodicals. The present paper is dealing with the study of the foll wing two subjects:(1) Observation of the flow patterns in a cup-jet absorber;(2)Approach to the correlated method of the pressure drop and the mass transfer data of the cup-jet absorber under the high liquid-gas ratio. The experiments were undertaken on air-ammonia-water system under the conditions of liquid-gas ratio m= 4to30 l/m3 and gas velocity WG=10to50m/s at the bootom of the cup. We arrived at the following conclusions: (1) The operation regions of a cup-jet absorber were divided into three differant flow patterns. The first state is known as a pulsation state, the second as a homogeneous and continuous state, and the third as an extreme turblent state. ( 2 ) We have presented the following empirical equations for a cup-jet absorber. In a dry column, if Re≤3.1×104, the pressure drop data for a cup-jet absorber are correlated La=8.95×10-1Re0.95 and if Re>3.14×104, La=1.168×10-1Re where La is the Lagranian number, and Re is the Reynolds number. In a wetted-cup column with the dimensionless group 0.06 and when , the flow state is of the second pattern, when , that is the third state, where the gas velocity at the bottom of the cup, m/s; the gas density, kg/m3; the gas viscosity, kg.s/m2; d0 -the diameter at the bottom of the cup, m. Besides, we have also found that the mass transfer data can be correlated by the following empirical equation; where, the overall gas mass transfer coefficient for a cup-jet in kg- mols/h.m3(unit molar concentration difference); NOG-the number of overall gas transfer units for a cup-jet.