Geothermal anomaly as a physical phenomenon of an active and latent volca nic area would be well recog-nized,and abrupt geothermal anomaly should also be understood.However,in practical work,thermal infrare d remote sensing techniques are frequently u sed to monitor geothermal flows of th e earth.But then,except for this typ e of thermal source in the surface thermal field,there still exist a lot of noises in th e area where the abrupt geothermal an omaly is generat-ed.By Analyzing the reason,we find t hat it is brought about by the non-bou ndless projection characteristics of objects.These noises may be divided into two c lasses:system noises and random noises.If disturbed noises have comparative sta-ble time sequence law and space sequence law,the noises are called system noises.And because system noises have a certain law,it is easy to remove the n oises.On the contrary,if disturbed noises have not law of time sequence a nd space sequence,the noises are called random noises.The random noises have the character of non-linearity,uncertainty and indeterminism.For this case,this p aper discusses the disturbed mechan ism of these noises as well as how to re move them.. Geothermal anomaly as a physical phenomenon of an active and latent volca nic area would be well recog-nized, and abrupt geothermal anomaly should also be understood. Now, in practical work, thermal infrare d remote sensing techniques are frequently u sed to monitor geothermal flows of th e earth.But then, except for this typ e of thermal source in the surface thermal field, there still exist a lot of noises in th e area where the abrupt geothermal an omaly is generat- ed.By Analyzing the reason, we find t hat it is brought about by the non-bou ndless projection characteristics of objects. These noises may be divided into two c lasses: system noises and random noises. If disturbed noises have comparative sta- ble time sequence law and space sequence law, the noises are called system noises. Since the system noises have a certain law, it is easy to remove the n oises. On the contrary, if disturbed noises have not law of time sequence a nd space sequence, the noises are called random noises. The ran dom noises have the character of non-linearity, uncertainty and indeterminism.For this case, this p aper discusses the disturbed mechanism of these noises as well as how to re move them.