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This invention relates to the field of pesticide technology, specifically to a fungicidal composition, its preparation method, and its uses. The invention provides a fungicidal composition comprising an active ingredient, a first functional component, a second functional component, and an adjuvant; the active ingredient comprises fluthiazopyrone and cyazofamid; the first functional component comprises at least one selected from silica, titanium dioxide, and zinc oxide; the second functional component comprises at least one selected from citric acid, acetic acid, benzoic acid, urea, and triethanolamine. By introducing specific first and second functional components, this invention synergistically works with the active ingredient, effectively overcoming the key defects of fluthiazopyrone's easy photodegradation and cyazofamid's easy hydrolysis, thus improving the stability of the compound formulation; while ensuring the excellent control efficacy and resistance management advantages of both against oomycete diseases such as grape downy mildew, it extends the duration of action and weather resistance of the agent, providing a more stable, efficient, and long-lasting solution for field application.