Peach tree leaves, flowers and nuts are toxic. Seeds, flowers, leaves and bark of the peach tree can produce hydrocyanic acid after hydrolysis. Peach leaves have been used as a laxative, insect repellent and treatment of whooping cough. Different varieties of peach tree leaf infusion (1%) to kill tsetse effect is basically the same, can make tsetse in 24 hours more than 95% death; low concentration (0.25-0.5%) infusion effect is not significant; fresh leaves and dry leaves are similar to the efficacy of the Culex mosquitoes, Anopheles sinensis, harassment of mosquitoes such as mosquitoes and butterflies all have a role. Some experiments have proved that peach leaves can replace chloroform or other anesthetics to kill Anopheles mosquitoes; young leaves are better than old leaves, fresh leaves are better than old leaves, and leaf rubbing is better than dipping. Because peach leaves contain glycosides, rubbing broken by enzyme action can release hydrocyanic acid. With a dilution of 1:100 or more of the peach leaf decoction in vitro direct microscopy or in vitro culture 1, 6, 12, 24 or 48 hours after observation, there is a role in killing leptospirosis.