Abstract: Due to the special soil properties of submarine silt, studies of its stabilization are still in its infancy. GS (Gypsum-Slag) agent is a novel green agent for stabilizing soft soil, which is produced mainly based on industrial solid wastes. This paper presents an application study of GS agent for stabilizing submarine silt. The submarine silt was sampled from a certain project in Hongkong. Unconfined compressive test is conducted to investigate the influence of binder content and curing age on the stabilized soil by GS agent and ordinary cement. The results show that as compared with ordinary cement, the GS agent stabilized soil has higher early strength and faster growth rate, with a strength improvement ratio ranging from 2.03 to 2.91. The regression model is established and the strength prediction method of submarine silt stablized by GS agent is proposed. The research results are beneficial to guide the resource utilization of industrial solid waste and green development of construction industry.