Abstract: In order to clarify the impact of photovoltaic module layout on electrical performance in the context of fishery photovoltaic complementary scenarios, this study takes a 100MW fishery photovoltaic complementary project in a certain region as a case study, and designs three schemes: flexible support modular layout, horizontal four row fixed bracket layout, and vertical double row fixed bracket layout. PVsyst simulation software is used for a full life cycle comparative analysis. The results showed that the horizontal four row fixed bracket layout scheme had an annual power generation of 125.3GW·h, a shadow loss rate of 7.6%, and a total loss rate of 21.8%. All indicators were optimal, achieving the best balance between power generation efficiency and shadow control, and providing an optimized engineering solution for the fishery photovoltaic complementary project.