Abstract: For controlling weeds effectively in film-covered flue-cured tobacco fields, the field experiments on spraying 4 kinds dosages (15, 30, 45 and 60 mL/667m²)of 36% Command ME, 5% Napropamide WP and water (CK)were conducted in 2000 -2001.The results showed that when Command was sprayed at a rate of 45 -60mL per 667m² after transplanting of tobacco seedlings, the control effects on both monocotyledonous and dicotyledonous weeds were over 96.7% after 80 days, and there was no negative effect on tobacco plants.