Experiments were carried out to study the whole process of Vicia faba's physiological stress due to Aphis craccivora feeding pressure on the basis of plant-insect experimental system. It is found that the aphid's pressure makes broadbean have stronger energy metabolism, higher activity of key enzyme in phenylaninemetabolism-PAL, more products of phenyline metabolism-chlorogenic acid.Meanwhile, peroxidase activity rises, water soluble protein relatively decreses, and membrane permeability increases. When aph...