A lifting oil cylinder support with floating support structure was designed by the topological optimization technology. The hydraulic pressure lifting system was simulated by AMESim software, and the load curve and the maximum load of the lifting oil cylinder support were obtained during lifting. Based on the maximum load, the load and its effects on the frame carling were analyzed by FEM. Afterward, the comparison and analysis were done among floating support structure and the other two traditional structures of jointing on bottom steel board structure and carling structure. The analytical results indicate that the lifting oil cylinder support with floating support structure is obviously superior to the other two structures. 