It is inevitable that portable diagnostic and therapeutic instruments carried by patients in a real life environment will encounter interference from time to time. The fault rates registered in the FDA for pacemakers and defibrillators are about 2%. Ectobody is affected by factors such as fixed methods, activities and circumstance such that a certain rate of abnormal incidents is unavoidable. A patient can still analyze an illustration with some faulty data; indeed, the valid data and conclusion should be fully utilized, in order to achieve the dynamic monitoring purpose. If 20% of the data in an illustration over several hours is faulty, the other 80% is still valid.