The core problem of IEC61850 information model conformance checking is how to express the information rules. Through the analysis of the SCL Schema, it is discovered that Schema only expressed the basic syntax of the SCL elements, constrained by the characteristics of Schema language, it has the weak expression of the information constraints between different syntax levels, and then can not be used to describe the whole rules of IEC61850 model. Through the introduction of Schematron language, and then with the analysis of expression’s regulations on SCL information rules, the IEC61850 modeling information’s complicated constrains are expressed. Expressions of SCL Schema together with Schematron are presented to wholly describe modeling rules of the IEC61850. Finally, based on the analysis of two methods of IEC61850 model’s conformance checking, it is concluded that the validating by composite pattern languages is a more simple and practical method.