The three-act and five-act opera Free Shooter is based on the German Ghost Story written by Appel and Braun. With prudence and originality, Weber completed this opera which occupies an important position in the history of European opera development in 18 17- 1820. Opera is developed under the background of strong Germanic customs and natural scenery on the stage, and music is integrated with literature and stage effects. Realistic scenery and creepy sound effects make the audience immersive, which leads to emotional deepening from visual and auditory stimuli, and repeatedly displays the unique artistic charm of traditional Chinese opera art in an all-round, multi-level and multi-expression way. Many scenes in opera are mainly about farmers' life and rural scenes. Therefore, composers take simple folk dance music and country music as materials, endow music with new language, have novel and unique national characteristics and form a unique romantic style. Such as the male chorus "Hunter Chorus" in the play. He also successfully used music to reveal the psychological activities of the characters. Weber made a sharp contrast between the recitative with language rhythm and the beautiful aria. Orchestral music also played an important role in this opera. Mendelssohn once praised Weber's Free Shooter as "the arsenal of romantic orchestral music".