The Battle of Hainan Island was a successful island battle in which the People's Liberation Army used wooden boats as the main navigation tool to break through the enemy's sea and air blockade. The reasons for success are as follows: firstly, the Qiongya column, a powerful support force, was effectively used, and illegal immigration and forced crossing of the river were correctly formulated? The idea of attacking independently, not relying on backup, and taking effective measures; Third, we made full preparations before the war and organized and commanded during the war. In the sea-crossing operation, due to the lack of cooperation between the PLA and air forces, it was impossible to cut off the retreat of the Kuomintang troops at sea. Therefore, it is inevitable that most of the enemy troops on the island will board the ship and escape.