The basic information, construction procedure and integration method of the semi Floating Production Storage and Offloading (FPSO) are introduced. The deformation of the lower hull without horizontal braces after float-off is calculated. The adjustment of ballast is carried out to ensure the misalignment of the main integration interface less than 105 mm, which is within 250 mm capture range of the integration guide. The design load of the integration guide is 6 120 kN, which is calculated after obtaining the horizontal stiffness at the main integration interface of the lower hull and topside structure. The contact condition between dock stools and platform bottom is analyzed, and the maximum supporting force (1 850 kN) of dock stools for lower hull local strength and dock foundation bearing capacity check are calculated accordingly. The horizontal stiffness of the lower hull at auxiliary integration interface (4.17×108 N/m) is calculated considering the actual contact condition between dock stools, lower hull and top side structure, and these results will be used for the calibration of possible misalignment at the auxiliary integration interface.