In order to solve the problem of GFRP tube in practical engineering, two or more than two GFRP tubes were spliced together and the mechanical properties of the joint were guaranteed. The experimental research on the mechanical property of continuous reinforced concrete-filled GFRP tubular specimen and splicing composite columns connected with steel bars, steel plates and steel tubes subjected to axial loading was conducted, and the results showed that the white stripes appeared on the surface of GFRP tube when the load respectively reached about 35%P_u (P_u -limit load), and the confinement effect of GFRP tube began to produce when the load reached 65%P_u. With continued loading, the confinement effect still existed, and the failure of splicing specimens with GFRP tube was a symbol, and the splicing specimens occurred near the end of connectors around 250 mm. Relatively, the failure of the continuous specimen occurred in the middle position along the length direction of the specimen. The chosen connecting ways with three methods could ensure the normal work of splicing reinforced concrete-filled GFRP tubular composite columns under axial compression.