Although the technology of cognition of pesticide safety has been used for a long time, but the topics of the research on the degree of consent of farmers to the cognition of safe use of pesticides is less touched. This study analyzes the extent to which pesticide safety use perceptions affect purchase intention. In this paper, the questionnaire is based on the safety use guide line of pesticides technology by Mr. Wang Chao Kun (2008). A total of 324 farmers in Pingtung County were surveyed, and 315 valid questionnaires. The study found that 99% of the farmers willing to purchase pesticides, 312 out of 315 farmers, although they have different perceptions about the safe use of pesticides, they will continue to purchase and use pesticides. Farmers have a hard demand for purchasing pesticide products. Pesticide toxicity, pesticide selection, tank mixing, safe harvesting period, application safety, poisoning and first aid effects of pesticide safety use positively affect farmers' purchasing willingness.