A content screening method, apparatus and system are provided for a content screening component to verify the trust relationship and the categorization standard used by a categorization component. A method includes the following steps: the content screening component receives a categorized content; and when determining that a first categorization component that categorizes the content is trustworthy according to the information of the categorization component carried in the categorized content, the content screening component screens the content by the content category carried in the categorized content. Another method includes the following step: when determining that the categorization component that categorizes the content uses the same categorization standard as the content screening component according to the information of the categorization component carried in the categorized content, the content screening component screens the content by the content category carried in the categorized content.