Histological and electron microscopic studies of canine pancrease were conducted with biochemical control of pancreatic enzyme activity before and after treatment of experimental hemorrhagic pancreatonecrosis. 30-60 minutes after the disease induction microfocal pancreatonecrosis was revealed, while 6-8 hours later subtotal hemorrhagic pancreatonecrosis with changes in microcirculatory vessels of the pancreas manifested in erythrostasis, thrombosis and fibrinoid wall necrosis accompanied by the increase of pancreatic enzyme activity and decrease in blood, lymph and serum antienzyme activity developed. The treatment of experimental pancreatonecrosis with endolymphatic injection of contrical resulted in the morphologically confirmed attenuation of the necrosis intensity, limitation of necrotic zone size, blood circulation recovery in microcirculatory system, marked decrease of proteolytic enzyme activity and increase of blood serum and central lymph antienzyme activity.