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Remote sensing satellites are widely used in many fields, including disaster prevention and mitigation, and bring great social benefits. The demand of natural disaster emergency for satellite monitoring has the characteristics, which is dynamic, efficient, multi-dimensional and multi-source, for multi-temporal and spatial elements; while the globalized revisit and the observation across borders for satellites is highly consistent with the demand of disaster monitoring. Based on the research and analysis of capability demand and application mode for remote sensing satellite in disaster emergency tasks, this paper gives analysis from three levels, which are single performance, capability index and application efficiency. This paper also establishes the emergency evaluation index system for disaster emergency monitoring based on remote sensing satellites, and gives the evaluation methods for primary indexes, which provide effective evaluation means and technical support for satellite applications in domestic and foreign major disaster emergency monitoring services.