One age category that is particularly susceptible to nutritional problems in adolescent girls. Globally, about 40% of deaths in developing countries are related to Chronic energy deficiency. Adolescents who experience a Chronic energy deficiency have an impact not only on the health of adolescent girls today but can have a long impact to become pregnant women and risk giving birth to a baby with low birth weight. This study to find out the effect of using chronic energy education models using web-based she Smart on knowledge, attitudes, and practice in adolescent girls. This study uses Pre-experimental Design, with a one-group pretest-posttest design. The sampling technique uses purposive sampling with a sample number of 47 respondents. This research was conducted in Senior High School 12 Makassar in September-October 2021. Analyze the data using the McNemar test. The results of statistical tests showed that there was an influence on the use of web-based She Smart education model of adolescent girls’ knowledge of with p-value= 0.012 (p<0.05), attitude with p-value= 0.031 (p<0.05), and practice with p-value=0.004 (p<0.05). Chronic Energy Deficiency education models using the Web she smarts can increase knowledge, attitudes, and practice before and after adolescent interventions.