The oriental hybrid lily ‘Sorbonne’ was used to precisely study the effects of high temperature on the flowering quality of lily. The changes in flower diameter， color， and content of cyanidin at different developmental stages of flower buds treated at different temperatures and times during the period of full bloom were investigated. The changes in the expression level of three key genes involved in the synthesis pathway of cyanidin including LhCHS， LhF3H and LhANS during temperature treatment were identified as well. The results showed that the S5 and S6 stages were key period for color development of 'Sorbonne' buds. The flower diameter was significantly smaller， the content of cyaindin was significantly reduced， and the color of tepal was lighter at the stage of full bloom after the buds were treated at a temperature higher than 30 ℃ for 4 days. The results of qRT-PCR analysis showed that high temperature treatment above 30 ℃ during the critical period of flower bud coloration significantly downregulated the expression of anthocyanin synthesis genes such as LhCHS， LhF3H， and LhANS， thereby affecting the synthesis of flower color during the period of full bloom. It will provide a theoretical basis for temperature control in the production and postharvest process of lily‘Sorbonne’.