Taking Lamiophlomis rotate as test material,the effects of inflorescence size on setting percentage and efficiency of Lamiophlomis rotate were studied.The results showed that the setting percentage of Lamiophlomis rotate was the highest when the number of single flower were 50-59.The setting efficiency of single flower was the highest when the number of single flower were 60-69.The ideal maturing rate was related to the 50-80 single flowers.The more or less number of single flower had an effect on the setting percentage.