The incidence of DHF in Indonesia in the last 50 years has increased with a peak cycle pattern every 6-8 years. The focus of vector control on chemical efforts has resulted in mosquito resistance in several areas, so it is necessary to use simple, environmentally friendly biological effort by using bay leaves as an electric liquid mosquito repellent. This study aims to determine the exposure of electric liquid vaporizer of bay leaf extract (Syzygium polyanthum) to the duration of death of Aedes aegypti. The study used a sample of 150 adult mosquitoes which were divided into 5 treatments (control, 20 ml, 40 ml, 60 ml, and 80 ml) and 3 repetitions for 30 minutes of observation duration. The results showed that the highest effect in killing 60% of Aedes aegypti mosquitoes occurred at 30 minutes duration of exposure to electric liquid vaporizer of bay leaf extract (Syzygium polyanthum) at 80 ml concentration. While 10 minutes duration of exposure did not give any effect to mosquitoes. The concentration of extract vapor on mosquito mortality, respectively, was 80 ml, 60 ml, 40 ml and 20 ml, resulting in 60%, 46.6%, 13.3%, and 30% mortality. However, the use of an electric liquid vaporizer has advantages and disadvantages to watch out for. It is recommended for further studies of vector control between types of electric vaporizers, dose variations and any types of plants. Keywords: aedes aegypti; bay leaf; duration of death; electric liquid vaporizer