This study was conducted to identify leakage of fluorescent substances out of 56 crops and to develop sorting methods of nonviable seeds of Chinese cabbage. Fluorescent substances were detected from 36 species, Chinese cabbage, radish, broccoli, cauliflower, egg plant and rape seed etc. In Chinese cabbage, the germination rate of non-sorted seeds decreased rapidly with ageing of seeds at 45℃ and 100%. After Chinese cabbage seeds soaked for 4hrs and coated with cellulose, the sorting ratio of non fluorescent seeds were decreased 91.3% to 1.7% by increasing ageing periods from control to 8 days, while fluorescent seeds were increased drastically from 8.7% to 98.3%. Also, incubation of water soaked dead seeds of Chinese cabbage treated with 0.5~1.0% ninhydrin and 0.01N sodium thiosulfate for 30~60 minutes at 35℃ developed purple color.