数字地球是一个复杂，动态变化的自适应网络系统。通过类比人类对外界刺激的反应过程和数字地球的行为，提出了以一种具有学习和空间处理能力的智能实体－空间智能体GeoAgent作为数字作自适应网络中的基本处理单元，并给出了基于GeoAgent的数字地球自适应网络的系统模。

Digital Earth is an adaptive network system which has characteristics of complexity and dynamic change.By comparing the human reaction to the stimulation from outside with the behavior of the Digital Earth.GeoAgent,an intelligent entity which has capabilities of learning and geospatial\|processing is proposed to act as the basic processing unit in the adaptive network system of the Digital Earth.Furthermore,an adaptive network system model of the Digital Earth based on GeoAgent is brought forward.