According to the development state of flower,the process of floral induction and blooming in Phalaenopsis was divided into four periods:pre-peduncle period,peduncle period,the bud appearing period,the blooming period.The distribution and cotransport of soluble sugar during floral induction and blooming period of Phalaenopsis was studied.The results showed that during this period,the soluble sugar content of different organs had their own regularity for change respectively.