Abstract: According to the development of the technologies of the marine phased array radar, the connotation, functions, significance and development trend of the overall technology are given, and the pratical significance of evaluation system is also discussed. Then, considering the fuzzy and random factors generated in the evaluation steps of index construction, parameter acquistion, qualitative representation into consideration, some key points of the evaluation of the overall technology of the marine phased array radar are studied in terms of the construction of the index system, evaluation flow, calculation steps based on the cloud model. The cloud model is characteristic of qualitative concept and quantitative expression featured as transformable aggregation. Finally, the model is verified to be applicable through an example.