Using ‘Ji Zhang Shu No.8’ as material, effect of different sowing periods on dry matter accumulationand distribution and yield of potato was studied in the paper. The results showed that from the later tu-ber growth stage to mature stage, leaves, stems, roots, stolons, tubers and the whole plant dry matter accumulationwere B2 ＞ B1 ＞ B3. During later tuber growth stage to mature stage, dry matter accumulation and yield of B2 weresignificant higher than other sowing periods, and the yield, 36 967.5 kg/hm², was the highest. Therefore, B2 was thesuitable sowing period.