Abstract: Multi-level delegation mechanism that meets management structure in most of organizations is an important strategy of authorization. Present Vega grid model has not discussed it deeply, and then the application is subject to certain restrictions because of lack of it. An authorization model with delegation based on Vega grid is proposed, meanwhile, authorities' collection and affiliation, subjects' collection and multi-level segmentation, resources-operation collection and authoritative relationship are formally defined. In addition, not only are search algorithm and data structure that implement the model also proposed, also quantitative analysis of its performance is done. The model supports multi-level delegation under the premise of generalization and ease of use, which extends Vega grid model to fit practical applications better.