Abstract: To enhance the research of mechanized operation for rapeseed, and understand the Yangyou NO. 6 suitable for mechanized operation, Field experiment were conducted on the sowing-date research of different varieties and density research of Yangyou No.6 under the different sowing-dates. Results showed that Yangyou No.6 had a higher output level and stronger ability to tolerate later sowing, and they all could have higher yield sowing before Oct.23. Under the condition of the different sowing-dates, the density had greater influence on Yangyou No.6's output. With the postponement of sowing-date, higher density (60×104plants/hm2、75×104plants/hm2)had better compensation function to output level of Yangyou No.6. Meanwhile, with improvement of density, some properties as shoot height, stem thickness were too obviously dropping, and more benefit to harvest by machine. From the experiments, Yangyou No.6 have better suitable for mechanized operation.