Abstract
The article concerns the principles of appeal proceedings, which have not been expressly regulated in the Public Procurement Law. Contrary to the previous legal solutions, the new act does not refer to the provisions of the Civil Procedure Code on proceedings before an arbitration court, which makes it impossible to use the rules of civil procedure in proceedings before the National Appeals Chamber. In the author’s opinion, the lack of a clear normative basis does not, however, prevent the rules from being constructed on the basis of the essence and nature of the appeal procedure. This allows the author to assume that the principles of proceedings before the National Appeals Chamber are as follows: the principle of disposition, adversarial procedure, the equality of parties and participants in the proceeding, openness, directness and formalism.