Construction machinery undergoes long-cycle ocean transportation in harsh environments with heavy salt fog, high humidity and variable temperatures. Metal parts, precision circuits and hydraulic interfaces are easily eroded. Simple packaging cannot resist marine corrosion, usually causing body rust, circuit short circuit and pipeline moisture damage after arrival, bringing extra renovation costs. Professional sea freight protection includes anti-rust spraying for exposed metal parts, circuit moisture-proof sealing, interface blocking and body reinforcement, fully isolating salt fog and moisture. Timely removal of protective materials and ventilation drying after receiving goods ensure quick equipment put-into-use and avoid transportation losses.