Abstract: In the process of optimizing the design of power supply lines for civil buildings, manual planning method is usually used to solve the optimization plan, which relies too much on the subjective experience of the designer, resulting in a final design line that is too long. Therefore, a method for optimizing the design of power supply lines for civil buildings based on suboptimal solution search algorithm is proposed. Establish an indoor environment map for civil buildings through multi camera video geographic mapping and overlapping view target optimization operations. Taking into account the requirements of the total length of the power line and the number of bending points, clarify the comprehensive goal of optimizing the design of the power supply line. Apply ant colony optimization algorithm to search for suboptimal solutions within the environmental map and generate a power supply design line that traverses all power supply nodes and meets the optimization objectives. The experimental results show that, taking a civil building with a total area of 25364m 2 as an example, the optimized power supply line designed by this method has a total length of only 12.68km, enhancing the rationality of the line design.