Conclusion In community-dwelling very elderly (≥80years) hypertensive patients, the baseline SBP showed a U-shaped curve relationship with the incident and development of long-term frailty, with the inflection points of the U-shaped curve being 135 mmHg and 140 mmHg, respectively, and the baseline PP level showed a U-shaped curve relationship with the development of long-term frailty, with the inflection point of 77 mmHg.