The efficacy and palatability test of 20. 02% diphenoxylate·barium sulphate baits against forest rodents was carried out. The results showed that the control effect in field in Heilongjiang Province were 50. 00%,75. 00% and 92. 94% with application dosage of 2,3,4 kg/ha respectively,which were54. 07%,77. 82% and 82. 87% in Qinghai Province. With the increase of the dosage,the effect of rodent control was correspondingly improved. The rodent had a higher food intake for the bait,and the palatability could me...