Plant growth is the result of material metabolism and energy transformation under two opposing processes:catabolism and anabolism. The metabolic balance of plants should be maintained for better acclimation to the surrounding environment. In the present study, growth parameters of the halophyte Suaeda heteroptera, which thrives in Shuangtai Estuary, were examined, including the height of plants and the amounts of carbon (C) and nitrogen (N) in the roots, stems, and leaves. The data collected were analyzed using three different models:the von Bertalanffy growth model, the logistic growth model, and the Gompertz growth model. The logistic growth model proved optimal because it minimized the effects of small sample size, is a bias-corrected form of Akaike's information criterion, and maximized the adjusted R square. The mean asymptotic height was estimated to be (38.11±2.59) cm when utilizing the multi-model inference approach. The absolute values of C in the root, stem, and leaf of S. heteroptera were (37.92±4.40)%, (39.98±3.12)%, and (28.27±3.41)%, respectively. The absolute values of N in the root, stem, and leaf of S. heteroptera were (0.68±0.35)%, (0.94±0.31)%, and (1.26±0.19)%, respectively. The allocation of C and N in the root was negatively correlated with the height of the plant. In comparison to the height (8.1-36.6 cm), the relative values of C and N in the root of S. heteroptera were (97.8±2.1) and (90.2±9.2), respectively, which implies that the accumulation of C and N in the root might be restricted by environmental conditions.