To screen Pennisetum forage varieties suitable for cultivation in the Chengdu Plain and surrounding ecological zones and clarify their production performance， nutritional quality， and cold resistance， Using nine elephant grass and hybrid Pennisetum varieties （lines） as materials， a three-year field experiment was conducted in Chongzhou. Agronomic traits， yield， nutritional quality， winter survival rate， and physiological indicators under low-temperature stress were measured. Comprehensive evaluation was performed using the membership function method and grey correlation degree analysis. GMY had the highest fresh yield （203 121 kg·hm^-2）， followed by CY1 （183 138 kg·hm^-2） and JMLC （168 798 kg·hm^-2）， respectively. CN005 had the highest soluble sugar content （91.19 mg·g^-1）. GM1 had the highest crude protein （6.82%） and crude fat （1.03%） content， indicating the best nutritional quality. CY1 achieved a winter survival rate of over 95% in low-altitude areas such as Chongzhou and Xinjin， and also showed stable performance in high-altitude cold areas such as Meigu， Sichuan， ranking first in the comprehensive evaluation of cold resistance physiology. GMY was suitable for promotion as a high-yielding variety， GM1 was suitable for silage， and CY1 possessed strong cold resistance， making it suitable for promotion in high-altitude areas. This study provides a scientific basis for variety selection and cold resistance mechanism analysis of Pennisetum in the Chengdu Plain and similar ecological zones.

Pennisetum  /  Membership function  /  Grey correlation degree analysis  /  Agronomic traits  /  Winter survival rate