Abstract: The attractive function of different floral parts of Trollius ranunculoides was studied in two populations distributed in the east Qinghai-Tibetan Plateau. The sepals, petals, and stamens were separately removed, and the types of visitors and visiting frequency were recorded. After separately removing the sepals and petals, the visiting frequencies of flies in Hezuo (0.033 and 0.114 time/flower·min) and Maqu (0.065 and 0.133 time/flower·min) were significantly less than those of the control, indicating that the sepals and the petals of T. ranunculoides were important structures to attract flies. Furthermore, after separately removing the sepals, the visiting frequencies of bees in Hezuo (0.266 times/flower·min) and Maqu (0.006 times/flower·min) were significantly less than that of the controls. After separately removing the stamens, the visiting frequency of bees in Hezuo (0.444 times/flower·min) was also significantly less than that of the control, but in Maqu (0.010 8 times/flower·min), there was no difference. The sepals and the stamens were important attractive structures for bees. These floral structures were not preferentially visited by ants indicating that they were ineffective in attracting them.