To solve problems as large scale, complex structure, numerous risks and difficult to make decision of large complex project, the risk decision method was proposed, based on hierarchical modeling, risk filtration, risk ranking and entropy decision. The hierarchical holographic modeling technique was applied to identify system risk. The risk identification model of satellite system development was developed, which overcame the limitation of sole model describing risk sources. The risk filtration, ranking and management technique was used to measure the identified risk factors through qualitative assessment and quantitative analysis. All the risks were ranked and the essential risks were determined. The entropy decision model was finally applied to evaluate the key risks. The optimal program was determined. A case of satellite development program decision was developed by using this method, which provided a new method for the large complex project risk decision making.
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