Abstract: The high loss rate in the rape mechanized harvesting process has restricted the rape production development, and it is difficult to be solved only from the farm machinery aspect. The plant material characteristic research based on mechanized harvesting adaptability for the direct seeding rape was done in this paper, which combined the machinery with agronomy. The whole performance characteristics of plant in field with different density were tested. At the same time the rape silicle abruption strength was tested under the situation of different maturity and the ripener spraying，and the essential date of the plant characteristic in field was obtained. The results showed that the moderate planting density was advantageous to the mechanized harvest work, and the ripener spraying had little influence on the mechanized harvest work. The plant performance characteristic of the direct seeding rape was obtained, which also afford the fundamental research foundation and the reference for the necessary agronomy of the rape mechanized harvesting.