The contents and compositions of pigments and chlorophyll fluorescence parameters including maximum fluorescence efficiency (Fv/Fm), the actual photo II chemical efficiency (ΦPS Ⅱ), the photochemical quenching coefficient (qP), the non\|photochemical quenching coefficient(NPQ) and the heat dissipation rate (HDR) in stems and leaves of Eupatorium adenophorum under low\|temperature(12℃), normal temperature as control(25℃) and high\|temperature (35℃) were determined and their changing tendency and magnitude were discussed in this paper. During the processes of low\| and high\|temperature treatments, the same tendency was observed in the changes of different pigment contents and their compositions in stems and in leaves, however, the magnitude of these changes in stems was obviously smaller than those in leaves. Likewise, the dynamic changes of chlorophyll fluorescence parameters in stems and leaves were in a similar tendency, while the magnitude of such changes in stems was generally smaller than that in leaves, e.g. at the low\|temperature treatment, the ΦPS Ⅱ and ETR in stems were 44% lower than the control, while it dropped over 60% in leaves; At the high\|temperature treatment, these two parameters in stems and leaves decreased 16%-57% and 50%-80%, respectively. Possible reason for these observations was the partitioning differences of the absorbed light between photosynthetic quenching(qP) and non\|photosynthetic quenching(NPQ). In the case of leaves, an increasing percentage of the absorbed light was used in heat dissipation via a sharp increase in NPQ and a decreasing percentage of such light were used in photochemical processes via a sharp decrease in qP, while in the case of stems, the proportion of light energy used in qP was slightly decreased (even increased) and a sharp decrease were found in NPQ under temperature stresses. This made a much smaller increase in HDR at stems comparing with leaves (p<0.05). Pooling all data for averaging analysis, chlorophyll in stems accounted 1/3-1/6 for that in leaves, the chlorophyll a/b was 20% lower than that in leaves. ETR of stems and leaves were similar, thus the utilization efficiency of photosynthetic pigments (ETR/Chl) in stems was much higher than that in leaves. The feature of chlorophyll fluorescence parameters of leaf and stem acclimatization to temperature stress, i.e. dynamics changes had the similar tendency, but magnitude for leaf was much larger than that of stem, made a larger photosynthetic contribution from leaves in suitable temperature, but an increased contribution from stems in temperature stressed habitats when leaf photosynthetic capacity were largely depressed. This photosynthetic strategy may favor the flourish of this species at suitable environment through large leaf photosynthetic improvement, while survive at stressed environments through the relative stable photosynthetic capacity of stems.