This paper is an analysis and summary about the causes of distortion cracks, including those caused by contraction of concrete and variation of temperature, and uneven settlement of foundation.
A predication model of grey system theory was proposed for observation of building settlement. With the model, the ground settlement and its variation speed could be predicated.
应用灰色系统理论建立建筑物沉降观测的预测模型，对建筑物的沉降量及相应沉速作出预测。
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The variation rules of soil settlement at different depths induced under normal and rotated conditions are also different.