The mutualism between the dioecious Ficus tinctoria and its pollinators was studied at Hsitzewan, Kaohsiung. I investigated the phenology of F. tinctoria from December 2004 to May 2006. Wasps trapped in sticky boards were recorded from April 2005 to May 2006. The average diameter of receptive figs (B phase) of female F. tinctoria was significantly different from that of functional male trees (P < 0.01), but both with similar coloration. The durations of pre-receptive figs (A phase) through wasp- releasing figs (D phase) or mature figs (E phase) in F. tinctoria were slight longer in winter and spring (8.3-8.8 weeks) than in summer and autumn (6.8-7.0 weeks). The receptive figs were asynchronous both within-tree and among-trees. The receptive figs occurred in every month of 2005 and without seasonality. There were considerable overlaps (82.6%) in the receptive figs between functional male and female trees. The frequency of tender leaf phase of F. tinctoria was positively correlated with local rainfall and temperature, but the frequency of leaf falling phase was negatively correlated with them. The frequency of receptive figs of female trees was only positively correlated with rainfall, and the frequency of their interforal figs (C phase) were both negatively correlated with rainfall and temperature. Fig production of functional male F. tinctoria was not correlated with rainfall and temperature. There are five species of fig wasps, including one species of pollinator (Liporrh opalumgibbosae), one species of Sycoscapter, two species of Philotrypesis, and one species of Neosycophila. No significant difference was found in the average number of 4 species of fig wasps from D phase figs (6.3 pollinators, 8.8 Philotrypesis sp.1, 5.7 P. sp.2, and 5.7 Sycoscapter sp.1 per fig). In addition, one species of Sycophila (Eurytomidae) was also found inside figs of F. tinctoria. The coordination between D phase figs of male F. tinctoria to its B phase was iii 26.2%, which was similar to the coordination of it to B phase of female trees (29.5%). However, more pollinators arrived on male trees than that on female trees. The coordination between pollinators and B phase figs of male trees (43.0%) was higher than that of female trees (14.6%). Fig-pollinator mutualism in F. tinctoria is probably maintained by its asynchronous phenology, and aseasonal changes of the receptive figs. Seed production at female trees can be maintained by a small size of pollinator populations.