Emergy analysis method provides a unified approach for the comparison and analysis of input and output of the agricultural ecological economic system, and its index system provides a quantitative method for calculating sustainable development of the agricultural ecological economic system as well. This paper calculated the emergy input of environment and resources and auxiliary energy, the emergy output, the emergy self-sufficiency ratio, the emergy investment ratio, the emergy yield ratio, the environmental loading ratio, and the emergy sustainability index of Ningxia agricultural ecological economic system. The analysis results show that the emergy input of environment and resources is too much, and Ningxia agricultural ecological economic system has high emergy self-sufficiency ratio, low emergy investment ratio, low emergy yield ratio and low environmental loading ratio which show that Ningxia’s agricultural development is still in the traditional agriculture model and it’s sustainable development index is in appropriate level.%能值分析法为如何分析和评价农业生态经济系统的投入和产出提供了统一的标准，其指标体系为农业生态经济系统可持续发展测算提供了定量方法。根据2013年数据，计算出宁夏农业生态经济系统环境资源、辅助能值等投入和能值产出，以及能值自给率、能值投资率、能值产出率、环境负载率、可持续发展指数等能值指标，分析结果表明：资源环境能值对宁夏农业生态经济系统投入较高，能值自给率高，能值投资率和能值产出率较低，农业发展还处于传统农业的经营模式；环境负载率和可持续发展指数处于比较合适的水平。
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