Abstract: The article focuses on legal and organizational problems of implementation of administrative responsibility for breaches of the legislation on contract system in procurement of goods, works, and services for state and municipal needs. The author carries out a detailed theoretical and legal analysis of the concepts of administrative responsibility. The article presents the author's position on the concept of legal regulation of administrative responsibility. The main attention is paid to the development of methods and methodology of administrative-legal regulation of responsibility in administrative law. The study shows the author's position on the interpretation and legal regulation of these categories. The methodological basis of the article comprises the current achievements of epistemology. The author applies the general philosophical and theoretical methods (dialectics, the systems method, analysis, synthesis, analogy, deduction, observation, modeling), the traditional legal methods (formal logical), and the methods used in specific sociological studies (statistical, expert evaluation, etc.). The author concludes that at present in order to ensure legality in the sphere of procurement of goods, works and services for state and municipal needs it is necessary to improve the forms and methods of administrative-legal regulation in this sphere. The main contribution of the author is the conclusion about the necessity to develop administrative-legal regulation of responsibility in the sphere of public procurement. The novelty of the article lies in the proposals for the development of forms and methods of state regulation of administrative responsibility and the creation of legal and institutional guarantees of legality in public procurement.