As one of the important routes for terrigenous matters entering marine ecosystem, atmospheric deposition has been one of the focuses of the interdisciplinary research in the atmospheric sciences, marine sciences, and environmental sciences internationally. In addition, atmospheric deposition is also a crucial manner to eliminate natural and anthropogenic pollutants from the atmosphere. Biogenic elements, including carbon, nitrogen, phosphorus, and silicon, etc., are the essential elements for the growth of marine phytoplankton. Thus, their inputs via atmospheric dry and wet depositions are likely to exert profound effects on the marine ecosystem. Study on the atmospheric deposition in the eutrophic China marginal seas is very important. As is well known, Jiaozhou Bay is a typical bay suffered from both the natural and anthropogenic emissions. It is an ideal area for explaining the potential effects from atmospheric deposition of biogenic elements on the marine ecosystem. In this study, based on one-year sampling for collecting the total suspended particulates (TSP) in the atmosphere and dry deposition samples between June 2015 and May 2016 at a shore-based site along Jiaozhou Bay, the contents of reactive silicate (SiO₃-Si) were determined for analyzing the concentration, dry deposition flux, and the dry deposition velocity (V_d) of SiO₃-Si. In addition, the potential ecological effects of SiO₃-Si dry deposition on the Jiaozhou Bay were preliminarily assessed. The results showed that the average concentration of SiO₃-Si was (1.98 ±1.22) nmol/m³ during the sampling period, with an obvious seasonal pattern of the higher values mainly occurred in winter and spring and the lower concentrations appeared in summer and autumn. The concentrations of SiO₃-Si showed a distinct trend of decrease from Qingdao coastal region to the Yellow Sea and East China Sea. The correlation analysis indicated that the long-range transport of Asian dusts and the resuspended of mineral dusts were the dominating source of atmospheric SiO₃-Si in Jiaozhou Bay and even in the entire China marginal seas. The estimated dry deposition flux of SiO₃-Si was 8.48 mmol m^-2 a^-1 with a deposition loading of 87.8 t/a, which was significantly larger than the reported values by wet deposition. In addition, the dry deposition loading accounted for 10.3% of the total exogenous inputs (including dry and wet deposition as well as riverine input) of SiO₃-Si surrounding Jiaozhou Bay, revealing the dry deposition was a non-negligible input source of SiO₃-Si for Jiaozhou Bay. The lower Si ∶ N molar ratios (0.16±0.22) in dry deposition samples suggested that atmospheric dry deposition was likely to be one of the potential factors leading to Si-limitation for phytoplankton growth in Jiaozhou Bay for a long time. Further, according to the Redfield ratio (C ∶ Si=106 ∶ 16), the new productivity supported by SiO₃-Si input via dry deposition was calculated to be 674 mg C m^-2 a^-1, which accounted for 5.3% of the total new productivity of Jiaozhou Bay, suggesting the impacts from dry deposition of SiO₃-Si. This study systematically analyzed the dry deposition characteristics of aerosol SiO₃-Si, evaluated the importance of atmospheric SiO₃-Si dry deposition loading for the total exogenous input of SiO₃-Si in Jiaozhou Bay. The results are of great significance for understanding the biogeochemical cycling process of Si in the marginal seas.