Abstract: Three compositae herbaceous plants native to alpine meadows of the eastern Tibetan Plateau were examined for their morphological plasticity of seedling height, leaf area and Specific Leaf Area (SLA) in response to several light and nutrient levels. Present study indicated that the morphological growth traits of seedlings in alpine meadow were affected significantly by light and nutrition factors. These three species` seedlings height and leaf area responded negatively to light, but increased radiation decreased SLA. The larger-seed species had larger initial seedling height. Seedlings from the smaller-seed species had much greater ability to adapt different environment heterogeneity than did the bigger-seed species. Seedlings from the smaller-seed species had much morphological plasticity than seedlings from the larger-seed species to different environmental heterogeneity in alpine meadow community. Environment conditions had a significant effect on the seedling growth, which was the phylogenic cause; but seed mass also had a significant influence on seedlings` growth, which also could affect the alpine meadow regeneration dynamics in the Qing-hai Tibetan Plateau.