明朝末年，朝廷腐败，关外努尔哈赤虎视眈眈，江湖动荡不安。在这动乱的时代背景下，一部名为《武当一剑》的电影展现了一个少年的崛起之路。

影片讲述了少年耿玉京投入武当门下，却因背负血海深仇，不得不踏上纷纷扰扰的江湖之路，追寻真相。剧情紧扣梁羽生同名小说，将国仇家恨与个人命运交织，展现了耿玉京在艰难抉择中逐渐成长为英雄少侠，最终成就武当一剑的壮举。

故事起始，耿京士与爱妻在朝廷腐败无能的局面下，选择私奔至辽东，然而却陷入了努尔哈赤手下的陷阱。耿京士被陷害成武当叛徒，何家一门惨遭诛杀，唯独年幼的耿玉京被托付给土家族人抚养。少年的耿玉京在成长的过程中遭遇百年大劫，他听从武当掌门无相的引导，开始调查当年江湖上的恩怨情仇。

在调查过程中，耿玉京的人生遭受重重变故：父母被害，兄弟背叛，心爱的人失踪。然而，正是在这一连串的磨砺和考验中，耿玉京逐渐成长，从一个籍籍无名之辈逐步走向成为真正的“武当一剑”，达到了道法自然的至高境界。

影片通过扣人心弦的情节和刻画细腻的角色塑造，展现了耿玉京在成长过程中的坎坷和磨难，也描绘了他在逆境中不断理解、感悟和坚韧向前的过程。柴碧云、于了一、翁虹和周航等演员的精湛表演，更是为影片增色不少。

In the last years of the Ming Dynasty, the imperial court was corrupt, Nurhachi outside the pass was staring at him like a tiger, and the world was in turmoil. Against the background of this turbulent era, a movie called "Wudang Sword" shows the rise of a teenager.

The film tells the story of Geng Yujing, a young man who joined Wudang sect, but because of his blood and deep hatred, he had to embark on the turbulent road of the rivers and lakes to find the truth. The plot closely follows Liang Yusheng's novel of the same name, interweaving national hatred and family hatred with personal destiny, showing Geng Yujing's gradual growth into a hero and young hero amidst difficult choices, and finally achieved the feat of Wudang sword.

At the beginning of the story, Geng Jingshi and his beloved wife chose to elope to Liaodong when the court was corrupt and incompetent, but they fell into the trap of Nurhachi's men. Geng Jingshi was framed as a Wudang traitor, and the He family was brutally killed, but the young Geng Yujing was entrusted to the Tujia family to be raised. The young Geng Yujing encountered a hundred years of catastrophe in the process of growing up. He followed the guidance of Wu Xiang, the head of Wudang, and began to investigate the grievances and hatreds in the world.

During the investigation, Geng Yujing's life suffered many changes: his parents were killed, his brother was betrayed, and his beloved disappeared. However, it was during this series of trials and tests that Geng Yujing gradually grew up, from an unknown person to becoming a real "Wudang sword", reaching the highest state of Taoism and nature.

Through exciting plots and delicately portrayed characters, the film shows Geng Yujing’s ups and downs and sufferings in the process of growing up, and also depicts his continuous understanding, perception and tenacity in the process of moving forward in adversity. The superb performances of actors such as Chai Biyun, Yu Yi, Weng Hong and Zhou Hang added a lot to the film.