Abstract: Background The blood pressure （BP） increases in cold seasons and exercise can reduce BP,but the effect of exercise habit on seasonal change of rest BP and exercise BP response is unclear. Objective To explore the effect of exercise habit on seasonal change of rest BP and exercise BP response in youth. Methods This study included 75 students having different exercise habit. The basic BPs were taken in winter and spring respectively. During the walking of 900 m within 9 min test,BP and heart rate（HR） were taken every 3 min. The areas under the curve （AUC） of BP and HR were calculated. Results ①Basic systolic blood pressure（SBP） was significantly higher in winter than in spring （125.7±12.2） vs （119.5±12.6）mm Hg,P＜0.05,and diastolic blood pressure（DBP） had increase tendency also,but the HR in two seasons was similar. ②Basic SBP and DBP in spring were similar,but SBP in winter was significantly higher in sometime exercise group than in often exercise group（both P＜0.05）. ③ Whether in winter or in spring,exercise induced obvious DBP increase and variation in sometime exercise group（P＜0.05）. Conclusion Good exercise habit can decrease seasonal change of basic BP and exercise BP response in youth.