A seed coating system was developed to screen non-viable seeds in the Brassicaceae. The crops studied were radish, chinese cabbage, broccoli, cauliflower and brussel sprout. Sinapine leaked more from artificially deteriorated seeds than non-deteriorated seeds. Seed coating with cellulose was to trap the sinapine leakage in the non-viable Brassicaceae vegetable seeds. The seeds were first hydrated, then coated with cellulose powder to capture the leakage. Coated seeds were dried, then sorted two fractions-fluorescent seeds and non-fluorescent seeds under the UV light. The ratio of the fluorescent seeds were higher in bad seedlot than good one. The germination rate were increased 3∼35% by eliminating the fluorescent seeds in tested Brassica vegetable seeds. Sowing non-fluorescent seeds resulted in a greater percent normal seedling than non-coated seeds in all seedlots. The fluorescent seeds contained a high percentage of the dead and abnormal seedlings.