This story is based on Lu's novel of the same name. Write the story of a martyr's daughter who was born in party member and disguised as a man to join the People's Liberation Army in the tragic revolutionary war of 1947. The film is full of revolutionary enthusiasm and sincere and cordial class friendship. In the arduous war of liberation, the people lived in dire straits. In order to better assist the work, the regimental headquarters sent Dashan, once the district monitor, to a platoon as the deputy platoon leader. Young hero platoon knew this news for a long time, and heard that the regimental headquarters sent a brave "lieutenant" to assist him in his work. I am very happy. I'm looking forward to meeting this man. The soldiers in the platoon are also very happy.

However, when Lei Zhenlin, the platoon leader, saw that this so-called "capable man" mountain was not quite what he imagined, he was very surprised and doubted his ability. He is wondering whether he can be competent for this position and lead everyone to fight and learn. Lei Zhenlin's thoughts are reflected in his own life and actions, as if he were deliberately testing and testing the new deputy platoon leader. However, the generous Gao Shan is like an innocent person who doesn't care about these things at all. As the saying goes, "a new official takes office with three fires." Although the new platoon leader looks like a weak man, he really has his own style. He pays great attention to military discipline and strictly abides by rules and regulations. No one can get his help.

Moreover, he is very concerned about the life of soldiers and does a good job in military-civilian relations. No matter who encounters difficulties in life, he will run to ask for help. So the soldiers and civilians here like him very much. In a mission, he successfully completed the task of "grasping the tongue", which was clean and neat, which made the whole platoon of soldiers secretly admire. Soon, the regimental headquarters issued an order. In the surprise attack on the enemy, Lei Zhenlin was trapped in the mill because of his carelessness and the temptation of the cunning enemy. The situation is very critical. Lei Zhenlin, who had a narrow escape, remembered how reasonable Dashan's criticism of his reckless actions was. But it's too late to regret. At this point, Gao Shan risked his life to rescue the cover brigade in Ke Cheng after it retreated. However, he suffered an injury attack, and Lei Zhenlin carried Gaoshan back to the hospital with tears. During the treatment, the doctor found that Gao Shan turned out to be the heroine disguised as a man to kill the enemy.