Abstract: To understand the growth regularity and confirm the best harvest time for sorghum hybrid sudangrass, its growth rate, fresh and dry matter accumulation and distribution during different growth stages were investigated, and its nutrient values evaluated in a field experiment. Plant height, growth rate, yield and ratio of leaf to stem of sorghum hybrid sudangrass all fit a Logistic model under dry farming conditions. Growth rate was slow until the 50^th day after seeding when it increased until the 80^th day, after which, it slowed until the 110^th day. There were no obvious trends of crude fat (EF) and hydrocyanic acid (HCN) while crude fiber (CF), nitrogen-free extract (NFE), dry matter yield, gross energy (GE), digestible energy (DE), metabolizable energy (ME), and total digestible nutrient (TDN) all increased. Crude protein (CP) and crude ash (CA) declined from tillering to the booting stages. Fresh yield was maximal at the later jointing stage (121.7 t/ha) while CP, CA, EF, CF, NFE and TDN were maximal at the 1.915 t/ha, 1.956 t/ha, 0.271 t/ha, 7.749 t/ha, 10.75 t/ha and 13 358 MJ/ha stages respectively. Dry matter yield was maximum at the booting stage (31.1 t/ha) while CP, CA, EF, CF, NFE and TDN were maximal at 1.920 t/ha, 2.126 t/ha, 0.348 t/ha, 9.070 t/ha, 15.51 t/ha, and 17 383 MJ/ha, respectively. It is suggested that for a high grass yield of sorghum hybrid sudangrass to be used as a green feed, it should be harvested in the later jointing stages while for a better dry matter yield and nutritive value as processing silage or hay, it should be harvested at the heading stage.