The State of Wei has been at war with the northern barbarian Rouran for years. The old Chanyu has the intention of retreating, but his son Maodun (played by Hu Jun) is violent by nature and intends to annex the Central Plains. In order to resist foreign enemies, the State of Wei recruited able-bodied men to join the army and serve the country. Considering that her father Hua Hu is old and seriously ill, his daughter Hua Mulan (played by Zhao Wei) resolutely decided to disguise herself as a man and join the army for her father. In the army, Mulan has not yet revealed her flaws because of her former playmate Xiaohu (played by Jaycee Chan) as a cover. By chance, the deputy battalion commander Wen Tai (played by Chen Kun) discovered Mulan's secret, but seeing that she is upright and has great kung fu, he concealed her identity for her. Later, Wen Tai fought side by side with Mulan, repeatedly defeated the Rouran army, and made military exploits, and both were awarded generals. However, Wen Tai found that Mulan was extremely emotional and impulsive on the battlefield, so he pretended to be dead and forced her to take charge. At this time, the Rouran tribe, which had been defeated repeatedly, had begun to retreat, but Maodun insisted on his own way. He not only killed dissidents, but even killed his father, and established himself as Chanyu, vowing to pacify the Central Plains. The biggest opponent that Mendu faced was the Wei garrison led by Mulan, and a thrilling life-and-death battle began... The film has Russian singer Vitas and Korean singer Lee Kyu-cheol joining in, and the ending song is sung by Stefanie Sun and Jane Zhang.