Abstract: From May to November 2008, biomass spatial fractal characteristics and phosphorus nutrient dynamics of Suaeda salsa under different growth conditions in the intertidal zone of the Yellow River estuary were studied. The logarithm values of aboveground biomass and plant height of S. salsa in middle (JP1) and low tidal flat (JP2) were linearly correlated, and the ranges of fractal dimensions (D) were 1.692-3.839 and 2.260-3.955, respectively. The dynamic accumulation of aboveground biomass of JP1 and JP2 had self-similarity, being a fractal growth process which fitted the increase rule of power function: D was 2.012 and 2.366, respectively. The changes of total phosphorus (TP) content in roots and stems of JP1 and JP2 were consistent, generally decreasing in the growing season, while TP content in leaves fluctuated greatly. The amount of P accumulation and rate of different organs of JP1 and JP2 showed significant seasonal changes, and the values in aboveground parts were generally higher than those in roots. The P allocation ratios were significantly different among different parts of JP1 and JP2 in different phases and were in the order leaf＞stem＞root, with values of (45.38±20.08)%, (38.88±20.30)%, (15.74±8.94)% for JP1 and (57.08±15.49)%, (35.30±13.12)%, (7.63±5.25)% for JP2 respectively. The N/P of JP1 plants (9.87±3.47) was less than 14, implying that N might be the limiting nutrient. The N/P of JP2 plants (15.73±5.00) was between 14 and 16 indicating that both might be limiting nutrients, but that the effect of P is greater. Further studies indicated that the differences between JP1 and JP2 in biomass, TP content, P accumulation amount and rate, P allocation ratio and nutrient limiting status were correlated to their ecological characteristics and water and salinity conditions of the habitat.