spread from country to country, become a serious public health problem. Taiwan is located in the subtropical area, like a little hot, and a little wet environment, it is the love of the environment for the growth of mosquitoes, dengue epidemic in high-risk areas. Aedes aegypti love inhabits artificial vessel, or is caused by man-made water areas; Aedes albopictus is love inhabits outdoor, and generally do not flow ditch became the mosquito breeding hotbed, ditch cover increase yarn net, also use rail way to push and pull the yarn net loss the replacement can effectively isolate dengue.