Taking the construction of the rule-of-law governm ent in Huainan City as a case，this paper discusses the practical mode and theoretical logic of the scientific democratization of modern administrative decision-making and the rule of law in the process of building a rule-of-law government. At the practical level，the Huainan municipal government gave full play to the leading role of the demonstration and creation of the rule-of-law government，based on the six index systems of improving the legal decision-making mechanism，public participation，expert demonstration，risk assessment，legality review，collective discussion and decision，and strengthening the standardization of decision-making，and actively explored the local model of scientific，democratized，and legalized administrative decision-making. At the theoretical level，the Huainan municipal government adhered to the ruling concept of people-first，the system logic of administration by law in the new era，and the goal-oriented decision-making logic of satisfaction principle，which has achieved the transcendence of traditional administrative decision-making. The practical tension in the process of building a rule-of-law government shows that the dynamic elements of decision-making should be further activated，and the awareness of modern decision-making should be enhanced；efforts should be made to promote interaction and integration，stimulate the synergistic effect of scientific，democratization and rule of law，and contribute experience to actively explore the construction model and path of the rule-of-law government with Chinese characteristics.