Abstract: In the report， aimed at the tropical marine environment， a GFRP pipe spiral hoop reinforced seawater marine sand concrete column product was proposed， the rusting and swelling reaction of its built-in reinforcement in the marine environment were used to improve its mechanical properties. Spiral hoop reinforcement， concrete strength， and external pipe were used as test variables to design and fabricate 20 GFRP pipe spiral hoop reinforcement seawater sand concrete column specimens， their axial compression performance under real tropical marine environment was investigated. The results indicated that the steel bar after soaking presents the phenomenon of uneven rust expansion， and the improvement of the strength of spiral stirrup and concrete enhance the axial compression performance of spiral stirrup seawater sand concrete column of GFRP tube. Under the immersion conditions of tropical marine environment， the axial compression load capacity of GFRP pipe spiral hoop reinforced seawater marine sand concrete columns and steel pipe spiral hoop reinforced seawater marine sand concrete columns with spiral hoop reinforcement is higher than that of the same type of unsubmerged specimens. FRP tubes and reinforced concrete columns can be used as the stress components of Hainan building structures， and the ultimate bearing capacity of the reinforced concrete columns can be designed according to the ultimate bearing capacity of the reinforced concrete columns after immersion in the real marine environment.