We provide Cadabia knowledge base system to store data created by a Computer Managed Instruction.Cadabia is based on an object-oriented architecture which including classes, objects, and relations. Because Cadabia is different from the traditional Relational Databases, we can use objects to represent data rather than querying multiple tables. When we stored metadata in Cadabia Knowledge Base, it can be more convenient to manage lots of data and easier to know which data come from object’s binary relations. Therefore we use an example to introduce this knowledge base.