Abstract: The study was based on the observation of the inflorescence development and sequence of flower differentiation in the Longan variaty of Dongbi.The result showed that the morphologic differentiation of flower bud in Longan could be divided into three stages,i.e.differentiation stages of main infloresence,lateral infloresence and flower organs,which were effected by the temperature in winter.In the basis of the initiation stage of the morphologic differentiation of flower buds in Longan beginning in the middle or last ten days of January,the relevant field practices for high and stable production including,cultivation of mother fruiting shoot,control of shoot and improvement of flower were also discussed.