The present application provides a ranking fraud detection method and a ranking fraud detection system for an application. The method comprises: a leading session detection step: detecting a leading session of the application based on historical ranking information; and a ranking fraud detection step: detecting the leading session based on at least one piece of evidence, to obtain a ranking fraud detection result. According to the method and the system of the present application, a ranking fraud act related to an application can be automatically identified, thereby allowing an application user to obtain real application ranking information.
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