As regard to Nguyen Thanh Binh's study, when they evaluated the effectiveness of the anti-hypertension of commune health center in ethnic Khmer people, also showed that the rate of salt eating among Khmer people in the study was high and significantly decreased after the intervention, in the intervention groups decreased from 91.5% to 80.8%, in the controlled groups decreased from 95.0% to 90.8%, the effectiveness of intervention reached 31.9% (p<0.05) [6].