As the cargo vessels are made huger, more robust, and equipped with more delicate navigation electrical maps or system, the enormously increased number of navigating vessels and operating harbor constructions have inevitably increased potential risk leading to a higher naval accidental rate across the crowded Taiwan Strait these years. Current study utilizes the risk management software- RM2S to analyze the root causes of the actual naval accidents collected by 孫暐炫(2008) at Kaohsuing Harbor of Taiwan. Conclusions are to analyze the risk factors and control measures to provide risk management solutions for prevention from those naval accidents.