Abstract: During April to June in 1983-1984, the measurement of atmospheric ice-nucleus con centration is made with mixing cloud chanber on Fujian Shita Mountain. The result shows that ice-nucleus concentration of Shita Mountain and North region of China have basically similar order of magnitude.The concentration of ice-nucleus is evidently lower in dense fog days. Both data from mixing cloud chamber and from millipore filters have been compared. It is shown that ice-nucleus concentration measured with mixing cloud chamber is lower than that with millipore filters.