Objective: The aim of the study is to investigate the circadian rhythm and detection rate of early evening elevated blood pressure (EEE) in treated and untreated hypertensive patients by ambulatory blood pressure monitoring. Design and method: From February 1, 2020 to February 28, 2023, the total of 1413 hypertensivs underwent ambulatory blood pressure monitoring in 13 medical institutions through the National 13th Five Year Plan Major Cooperation Group for Chronic Disease Prevention and Control (Research on the Application of Lifestyle and Nutritional Intervention Techniques and Strategies for Obesity and Hypertension, No. 2016YFC1300100). Among them, 1026 had taken antihypertensive drugs and 387 had not taken antihypertensive drugs. EEE is defined as average systolic blood pressure is higher or equal to 135mmHg or average diastolic blood pressure is higher or equal to 85mmHg from 6PM to 10PM. The definitions of dipper, non-dipper, super-dipper, and reverse-dipper blood pressure refer to the 2020 China Ambulatory Blood Pressure Monitoring Guidelines. Results: 1. The detection rate of EEE in treated hypertensive patients was 60.4% (620 patients), while the detection rate of EEE in untreated hypertensive patients was 70.5% (273 patients); 2. The detection rate of dipper type in treated hypertensive patients was 21.7% (223 patients), while the detection rate of dipper type in untreated hypertensive patients was 21.7% (84 patients); 3. The detection rate of non-dipper type in treated hypertensive patients was 51.4% (527 patients), while the detection rate of non-dipper type in untreated hypertensive patients was 53.5% (207 patients); 4. The detection rate of super-dipper type in treated hypertensive patients was 1.6% (16 patients), while the detection rate of super-dipper type in untreated hypertensive patients was 1.8% (7 patients); 5. The detection rate of reverse-dipper type in treated hypertensive patients was 25.3% (260 patients), while the detection rate of reverse-dipper type in untreated hypertensive patients was 23% (89 patients). Conclusions: The detection rate of EEE is significantly higher than that of traditional non-dipper, super-dipper, and reverse-dipper blood pressure; It is possible that EEE become a new target for antihypertensive treatment.