Focusing on the technical objects, the relation of technical objects is analyzed on the basis of the product data concept model and the integrated product model by Schöttner. Taking for coding as a tie, the relations among the parts, the documents, the drafts and the models are explained as well as the revised coding solutions. Taking diesel engine enterprise as an example, the deficiencies are pointed out based on the data model status, and the corresponding improved suggestions are proposed. The relations model of technical objects is applied for the enterprise. The application indicates that the model realizes the reusing of existing resources, improves the efficiency of enterprise personnel. It is the guide of implementation for information in future.