Blood pressure parameters (BPPs); Systolic, Diastolic and Mean Blood Pressures, have high correlation relationship with heart rate( HR), but this relationship is nonlinear, multimode, and ambiguity. Type-2 Fuzzy system has capability to deal with high uncertainty problems and is utilized to deal with BPPs and HR relationship.This paper presents an Interval Type-2 Fuzzy System to estimate Systolic, Diastolic and Mean blood pressures; based on the relationship between systolic, diastolic and mean blood pressures and heart rate. The estimated systolic, diastolic and mean blood pressures’ values are compared with real reading of systolic, diastolic and mean blood pressure. Very encouraging results have achieved; the absolute value of mean of difference between real systolic, diastolic and mean blood pressures and estimated values are less than 5 mmHg.