The invention discloses a 
greenhouse circular cultivation method for 
cedrela sinensis. The method comprises the following steps: culturing seedlings, selecting parcel of 
paddy field, applying special 
fertilizer for 
cedrela sinensis, preparing a 
greenhouse and equipping the 
greenhouse with automatic sprayers, roller shutters and supplementary lighting lamps; preparing a garden 
bed in the greenhouse; planting the 
cedrela sinensis seedlings at the end of November and planting and hole-
sowing in the ratio of 150 plants / 
square meter; fully watering the root-fixing water and watering 
seedling-returning water for one time after the seventh day; after 17-day 
dormancy, carrying out sun-shading and adding a cotton quilt; increasing temperature, supplementing light, supplementing 
humidity and guaranteeing 7-hour light illumination each day; keeping the temperature at 15-30 DEG C; keeping 75% 
humidity; supplementing 
light at night and maintaining the temperature; after 
sprouting for 2-3 days, applying 0.5% of a leaf 
fertilizer; after 
sprouting for 3-4 days, applying 5ppm 
auxin; preventing and controlling 
plant diseases and 
insect pests; picking after 
sprouting for 9 days; ending the picking period, sawing the 
trunk, only maintaining 10-15 centimeters and maintaining 10 
centimeter roots as the biennial cedrela sinensis for continuing the 
greenhouse cultivation; and leaving the planting hollow at this season as the 
seedling culture field in the next year. The cedrela sinensis cultivated according to the invention has the advantages of high 
growth speed, high yield and high quality; the speed of breeding new seedlings is high; the use ratio of land is high; the variety cannot degrade.