Geothermal anomaly as a physical phenomenon of an active and latent volcanic area would be well recognized, and abrupt geothermal anomaly should also be understood. However, in practical work, thermal infrared remote sensing techniques are frequently used to monitor geothermal flows of the earth. But then, except for this type of thermal source in the surface thermal field, there still exist a lot of noises in the area where the abrupt geothermal anomaly is generated. By Analyzing the reason, we find that it is brought about by the non-boundless projectioncharacteristics of objects.These noises may be divided into two classes: system noises and random noises. If disturbednoises have comparative stable time sequence law and space sequence law, the noises are called system noises. And because system noises have a certain law, it is easy toremove the noises. On the contrary, if disturbed noises have not law oftime sequence and space sequence, the noises are called random noises. The random noises have the character of non-linearity, uncertainty and indeterminism. For this case, this paper discusses the disturbed mechanism of these noises as well as how to remove them.