The comprehensive concept and contents of meta decision-making (MDM) was described.  It was emphasized that MDM is a plan and design for the system, organization, goals and procedure of decision-making.  A twolevel structure for decision-making consists of MDM and a practical decision, which would facilitate scientific and democratic decision-making. Thinking about organizing, general principles and steps of decisionmaking was given.  The relation between MDM and knowledge management was also described.