Hybrid rape generally twitches and flowers in March. Before March, twitching and flowering is considered as early as early flowering. Production practice shows that early rape and early flowering of rapeseed is vulnerable to freezing injury, flowers can not be pollinated, resulting in reduced yields and even no harvest. Therefore, early picking of rapeseed should be promptly removed. Three points should be noticed when removing the tip of a file: A picking time should be selected when the temperature is high at noon on sunny days to facilitate wound healing. Second picking parts should be appropriate. It is advisable to remove the tip of a tip 10 centimeters from the ground. After three exhumations, topdressing was applied in time to promote new growth and branching. Generally, about 30 mu of urine and manure can be used.