Abstract: Forty-six native species of Dendrobium were cultivated and observed for five years，22 indexes including flower color，flower diameter，flower type，number of flowers，fragrance，flowering days，nature flowering time，labellum，survival rate，disease resistance，insect resistance，plant height，plant type，growth vigour， pseudobulb shape，internode，pseudobulb color，leaf color，leaf texture，leaf type，new bud number，fruiting rate were comprehensively evaluated to establish the evaluation system of ornamental and utilization value of Dendrobium by means of AHP. The results showed that survival rate，plant type and flower color had important effects on the ornamental and utilization value of Dendrobium，and their weights were 14.3%，13.4% and 13.3% respectively. 46 species of Dendrobium were clustered into 4 grades by K-Means cluster method. There were 10 species in graded Ⅰ class，18 species in graded Ⅱ class，11 species in graded Ⅲ class，7 species in graded Ⅳ class， the occupancies were 21.7%，39.1%，23.9% and 15.2% respectively. By using the evaluation system，Vietnam native species including Den. chrysotoxum，Den. pulchellum and Den.signatum，Chinese native species like Den. polyanthum，Den. lituiflorum， Den.hercoglossum，Den.nobile，D.densiflorum，Den.thyrsiflorum and Den. gratiosissimum were screened out，they had superior ornamental value and was fit to pot production by tissue propagation