Influence of different cultivated areas on the processing-grade tuber yield, specific gravity, reducing sugar content and tuber qualities of five promising varieties was studied to get the basic information for selecting potato varieties with good processing quality under the different cultivated conditions on Korea. The average total tuber yields of 5 tested varieties at the 2nd harvest time was 3,.051kg/10a in Daekwallyoung. The processing-grade tuber yield of the late-maturing variety of Gemchip was over 3.2 tons per 10a, whereas that of late-maturing variety, NS1 was 2.8 tons per 10a. The dry matter content of the tubers produced from Daekwallyoung was the highest, followed by the order of Bosung, atlantic was the highest in dry matter content, followed by the order of NS1, NS2, Superior and Gemchip. Degrees of change in glucose content as affected by change of cultivated areas were different among varieties. Atlantic and NS1 showed less change of glucose content as compared with other varieties.