The pummelo [Citrus grandis (L.)] production status and problems of Zhejiang province as well as research progresses were reviewed, with an emphasis on Citrus grandis (L.) Osbeck cv. 'Yongjaizaoxiangyou' production in the thesis. Critical techniques for 'Yongjaizaoxiangyou' were improved and then extended to deal with severe problems such as low yield, juice sac cracking and granulation, low fruit quality, poor production standardization, etc.Biological and agricultural characteristics of 'Yongjaizaoxiangyo...