This paper investigates the integral lifting and launching technology for a new type of offshore floating photovoltaic （FPV） modular support structure. Based on the finite element software ANSYS

numerical simulations of the entire lifting and launching process of the support structure into the water were conducted. Through comparative analysis

an optimized selection scheme for the bottom components of the modular support structure was determined. The construction processes of two-point lifting

three-point lifting

and four-point lifting were analyzed and compared to identify the optimal lifting point arrangement for the modular support structure. The influence of errors

such as the position of lifting lugs and the length of lifting cables

on the internal forces and deformations during the lifting process of the modular support structure was emphatically analyzed

and corresponding error control indices were proposed. The analysis results indicate that the four-point lifting condition with lifting points at the trisection points of the long sides is optimal. When the position error of the lifting lugs exceeds 10 mm

the uneven difference in the internal forces of the lifting cables exceeds 57%

suggesting that the position error of the lifting lugs should be controlled within ±5 mm. When the length error of the lifting cables exceeds 67.5 mm

the overall structural deformation reaches 77 mm

and the vertical deformation difference of the structure exceeds 35 mm

recommending that the length error of the lifting cables be controlled within 67.5 mm.