This article studied the influence of different concentration of tetrazolium solution(0.2%,0.5%),dyeing temperature and dyeing time to figure out the best staining condition.Comparison of the germination percentages has got determination patterns of P. armandii seeds:the best testing condition for P. armandii seed viability determination was 5 h staining with 0.5% TTC at 30 ℃ under darkness;embryo fully stained and less than 1 / 3 portions of endosperm unstained are viable seeds.