The purpose of this research was to compare value priorities of secondary school students, their parents, and their teachers in Lorestan province; and also to determine the similarities and agreement of participant of grading value priorities by using multi-stage cluster sampling. Fourteen hundred and seventy four secondary school students accompanying with their parents and teachers were chosen and responded to the Mansoor's value test. The results shows between new generation (students), middle generation (teachers), and eldest generation (parents), a significant difference was observed (P < 0.01); except these values: "to be good student" (P = 0.229), "to be concerned about others" (P = 0.115), and "to defend their own interests" (P = 0.289).Between female and male students a significant difference was observed (P≤ 0.05); except these values: "to be handsome", "to be skilful", "to subordinate", and "to defend their own interests" . The most similarities in grading values were between parents and students. All three groups of participants considered "to have faith in God" as the most important value as the first priority, and "to be wealthy" as the least important at the bottom of 20 scale grading values. The first five priorities of all participants were: "to have faith in God", "to be polite", "to be honest", "to be in agreement with parents", and "order and discipline". The last five priorities were: "to be skilful", "to be handsome", "to be robust and strong", "to be fluent in speaking", and "to be wealthy".