Abstract: In order to study genotype, environment and their interaction effect on main agronomic characters of Panicum miliaceum, the growth period, plant height, stem nodes, main spike length, spike grain weight, 1000-grain weight and yield 7 main characters, variety stability and adaptability were investigated with combined variance and AMMI model methods in 11 different environments pilot. The main agronomic characters of P. miliaceum between different genotype and environment existence were extremely remarkable difference. Genotype effect on main stems obviously, and environment on plant height, genotype and environment interaction on grain weight. All varieties of 7 agronomic traits of variation coefficient, the largest was production, up to 42.72%, followed by spike grain weight and plant height, respectively achieved 37.90% and 26.74%. The variation coefficient smallest was growth period, only to 14.89%. All test pilot, Gan 9133-1-3-4-1 yield was the highest, Yumi 3 (CK) variety stability was the highest of all. Ningxia Pengyang and Shanxi Yanan had higher yield, and variation degree was small, advantageous to variety discernment of varieties.