Abstract: Carried out in October 2018, May and August 2019, this study investigated the composition of nitrogen and phosphorus and their relative transport contribution in the main estuaries and discharge outlets around Laizhou Bay and Yellow River. The results show that both nitrogen and phosphorus were in high concentrations with significantly different spatial distribution. The concentrations of total nitrogen and phosphorus in eastern estuaries were generally higher than those in western and southwestern estuaries, and both dissolved inorganic and organic nitrogen to phosphorus ratios were in high levels. As the main forms of nitrogen, the dissolved organic nitrogen and nitrate accounted for 59% and 29%, respectively, of the total nitrogen in Laizhou Bay. The proportion of different phosphorus forms varied greatly, and the average proportion of particulate phosphorus exceeded 50% in the western and southwestern estuaries, which may limit the recycling of phosphorus. The composition and structure of nitrogen and phosphorus in the estuaries would further expand the characteristics of "high nitrogen, low phosphorus" and high nitrogen/phosphorus ratio in Laizhou Bay. Although the total nitrogen and phosphorus concentrations in the eastern estuaries were generally higher than those in the western and southwestern estuaries, the overall contribution of nitrogen and phosphorus from Yellow River and Xiaoqing River with high runoff was over 90%.