Abstract: Foor snail-ridden fish ponds and their adjacent snail-ridden weedlands and irrigation ditches in Anhui and Jiangxi Provinces were selected for enlarged field trials of bromo acetamide. Results showed that the molluscicidal effects of bromoacetamide was satisfactory. When it was applied at the dosage of 1g/m2 along the pond banks and then shovelling down the turfs on the banks for immersion, or sprayed at 1g/m2 in the weedlands, or sprayed at 1g/m2 and then shovelling down the turfs in irrigation ditches, good molluscicidal effect was achieved. 100% of snail eggs were killed by spraying at 1g/m2. It did not kill fishes in the ponds, and did not affect the growth of rice seedlings when 10 ppm solution was used for irrigation in paddy fields.