Starting from the definition,this paper aims to compare discretion in administrative planning with administrative discretion in general sense,figure out its feature and cause,and finally determine its status in the traditional discretion theories.

Of course, judges can not exercise discretion arbitrarily.

However,because principle is necessary connection with discretion,reasoning by principle will be very arbitrary;especially when principles contradict with rules.

The connection between rules and principles is that of rigid regulations and discretions.

Ethical Dimensions of Administrative Compulsion —— free judgment, conformity to objectives and appropriateness of selection;

Administrative free judgment is a vital right which is entrusted to administrative institution by law.

The principle of "Trust and Honesty" originates from Civil Law containing honest contract and trusty suit, the two aspects of which in current civil law, that is honest and trusty requirement and the right of free judgment, are the further development to it.

The power of free adjudication externally exists in judge s valuation of evidence.