method. Results showed that the tensile strength of erect crownvetch strain stems were maximum (14.88～26.80MPa). The average largest load of creeping type, half crawl type and erect crownvetch strain were 88.88N, 152.70N and 187.10N, respectively; the cellulose contents of above stems were 13.59%, 13.87% and 15.52%, respectively; the lignin contents of above stems were 4.47%, 4.18% and 3.95%, respectively; the protein contents of above stems were 3.83%, 4.55% and 2.74%, respectively. The cellulose contents, lignin contents and protein contents increased with the reduction of moisture content. The strength and stiffness of creeping tangled forage stems mainly depended on the content, connection mode and alignment of cellulose and lignin. Erect crownvetch strain were easier to mechanized harvest than others because of its low ratio of lignin to cellulose.