T The executive function has a role in supporting one's learning ability, As for one of the various things that is considered to affect one's executive function is sleep. But in fact most students lack sleep (<7 hours). This study aims to look at the relationship of academic stress with smartphone addiction in high school students in Surakarta. The study was conducted at SMAN 1 Surakarta by Cross sectional study. The sample of this study was students of class X and XI of SMAN 1 Surakarta, who were selected by simple random sampling totaling 205 people. Measurement of academic stress levels using the DASS-42 questionnaire. Whereas the measurement of smartphone addiction uses the SAS-SV questionnaire. Data analysis to find the relationship between academic stress and the addiction of smart phones used in this study was the Chi-Square Test with a significance limit of p <0.05. Based on the results of an analysis of 205 studied, 82 people experienced stress and 123 people did not experience stress. Of 82 stressed people, 48 people (54.5%) experienced smartphone addiction and 34 people (29.1%) who did not experience smartphone addiction. While in 123 people who did not experience stress, 40 people (45.5%) experienced addiction to smart phones and 83 people (70.9%) did not experience addiction of smart phones. From the relationship between academic stress and addiction of smart phones obtained p = 0,000 (p <0.05) so that it was concluded that is a significant between academic stress and smartphone addiction. There is a significant relationship between academic stress and the stress of smartphone addiction in high school students in Surakarta