In order to promote scientific utilization for wild forage resources, and to promote the ecological environment protection and sustainable and healthy development of grass husbandry, a total of 120 representative wild forages from southwest karst mountainous areas were collected in this experiment, and the conventional nutrient contents of them were measured, and clustering analysis was carried out according to nutritional value. The results showed that, the crude protein (CP) content of 14 wild leguminous forages ranged from 9.93% to 27.17%, and the contents of ether extract (EE), crude fiber (CF), neutral detergent fiber (NDF), calcium (Ca) and phosphorus (P) ranged from 1.44% to 10.38%, 13.93% to 38.03%, 24.44% to 66.68%, 1.07% to 2.64%, 0.09% to 0.85%, respectively. The contents of CP, EE, CF, NDF, Ca and P in 27 wild gramineous forages ranged from 3.86% to 22.70%, 0.51% to 5.18%, 28.18% to 47.50%, 46.21% to 77.87%, 0.62% to 2.66%, 0.08% to 0.40%, respectively, and the CP content was negatively correlated with CF content (P＜0.01), while it was positively correlated with P content (P＜0.01), the binary correlation equation was y=22.30-0.44x1+23.49x2 (x1=CF content, x2=P content; r2=0.85). The contents of CP, EE, CF, NDF, Ca and P in 79 other families wild forages ranged from 4.40% to 29.02%, 0.56% to 6.84%, 11.74% to 51.63%, 20.60% to 87.51%, 0.25% to 5.00%, 0.06% to 1.22%, respectively, and the CP content was negatively correlated with CF content (P＜0.01), while it was positively correlated with P content (P＜0.01), the binary correlation equation was y=21.45-0.36x1+7.17x2 (x1=CF content, x2=P content; r2=0.72). For all tested 120 wild forages, the CP content was negatively correlated with CF content (P＜0.01), while it was positively correlated with P content (P＜0.01), the binary correlation equation was y=21.86-0.36x1+8.06x2 (x1=CF content, x2=P content; r2=0.62). The conclusion of this study is that, of the 14 tested wild leguminous forages from southwest karst mountainous areas, the superior forages are 6 (42.86%); of the 27 tested wild gramineous forages, the superior forages are 9 (34.62%); of the 79 tested other families wild forages, the superior forages are 65 (82.28%); of the 120 tested wild forages, nutritive value of Viburnum opulus Linn. var. calvescens (Rehd.) Hara, Siegesbeckia orientalis Linn., Argyreia seguinii (Levl.) Van. ex Levl., Sophora xanthantha C. Y. Ma, Alternanthera Philoxeroides (Mart.) Griseb., Chrysopogon aciculatus (Retz.) Trin., Hippochaete hiemale (L.) Boerner, Ilex chinensis Sims, Rorippa indica (L.) Hiern, Magnolia multiflora M. C. Wang et C. L. Min are similarity, and they are farther away to other tested forages.
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