In regular places to buy insecticides in accordance with the instructions for use under the premise of even smell a night is not poisonous, but still do not rule out the existence of special circumstances. Currently on the market all kinds of insecticides are sold through the national safety monitoring, and insecticidal effect is better safety is high. Although all kinds of insecticides exist some cypermethrin, aminopyralid and other toxic ingredients, but in small doses the human body can tolerate, according to the instructions for the correct use of the general will not reach the dose of poisoning. However, due to the existence of individual differences, the people who are allergic to the various components of the insecticide are not suitable for use. Infants, young children, pregnant women, the elderly and special people with respiratory diseases, is not suitable for spraying insecticides in the premises for a long time to avoid high concentrations of insecticides induced respiratory symptoms, and even produce nausea, vomiting, headache, dizziness and other discomforts. It is recommended that the correct use of insecticides, after the realization of the purpose of insecticides, open the windows in a timely manner to ventilate, do not stay too long in the place where there are insecticides, and after the symptoms of discomfort in a timely manner to the open, open environment to breathe more fresh air, and to observe the symptoms whether there is a reduction in the symptoms, if there is no reduction but rather aggravation of the recommendation to seek medical treatment in a timely manner.