The kernel of Open Educational Resources ( OER) is its content, and the high exetent of content sharing is the essence of the "open" idea. It is a main approach to meet the openness requirement to construct the resources ac-cording to some content standards. According to the characteristics of OER, such as reusability, accessibility, open-ness and interoperability, this paper analyses the content standards related to OER, including the content model, con-tent package, metadata and content classification. An extension information model with six concrete content forms is proposed to support multi-granularity of content. Metadata schema is extended to describe the content granularity and the open licensing which makes up for the deficiency of the description of resource rights. Suggestions for the applica-tion of content classification and package standards are given to help describing the classification in metadata and pro-cessing resources with different granularity.