The container-loading problem occurring in on-the-spot freight production is often with several constraints and objectives, i.e., complex container-loading problem. The robustness, parallelism, and a variety of applications in the solution of NP complete problem of genetic algorithm demonstrate genetic algorithm is an effective approach to solve complex container loading problem. In this paper, the genetic algorithm for complex container-loading problem is studied, the effective coding and decoding method is given. The numerical solution of example shows that the algorithm is effective.