Abstract: In order to clarify the high yield and high efficiency cultivation technology of new sugarcane variety Yunzhe 05 - 51, the wide application of this variety in production was accelerated. The effect of sowing date and planting density on the yield and its components of sugarcane variety was studied in Longchuan get base in 2014 - 2016 at four different seeding time and four planting density treatments. The results showed that the sowing date had a significant effect on the stem diameter, effective stem number and yield of cloud 05 - 51", but had no significant effect on plant height and brix. The planting density had a significant effect on brix and cane yield of" Yunzhe 05 - 51". The average yield of sugarcane was as high as 150.70 t / hm 2 in January 20, and the difference of yield increase or decrease with the postponement of sowing date after January 20. When planting density B1 ( 150000 bud / hm2 ), the yield of sugarcane reached the highest value of 127.25 / hm 2, and the yield of sugarcane stem decreased with the decrease of planting density. Considering the interaction effect of sowing date and density, the best sowing date and planting density of " Yunzhe 05 - 51" were sown on January 20, and the planting density was B1 ( 150000 bud / hm 2 ).