Onchocerciasis affects 20 to 30 million people worldwide, 95% of them in live Africa. An estimated one million blind people are affected by onchocerciasis. It is transmitted by the bite of females of the genus Simulium, of which more than 1300 species have been described in the world. The 15 health areas of the Kinshasa city under ivermectin, do not cover all the meeting points between blackfly and man in the simulidian foci of Kinshasa. The best way to protect against exophilic vectors (exophagous), which in addition have a biology little known like all the species of black flies known until then, is the use of the repellents of which the most used currently is the DEET. But these products are not very accessible to the African populations (due to cost and availability). It was then necessary to propose a solution adapted to our societies. Thus, the repelling efficiency of Cocos nucifera oil was tested against DEET against Simulium squamosum. Selected technicians were treated by anointing their legs and forearms, each with a particular repellent and placed on the ground to capture the black flies according to the traditional method of catching on human bait. Blackflies captured by repellent treatments were counted and their numbers compared using statistical tests. Statistical analysis of the number of blackflies caught by treatment revealed no significant differences between DEET and Cocos nucifera. In dermal application, the oil of Coconut has real repulsive properties against Simulium squamosum compared to DEET.