The characteristics

steps and knowledge formation of mechanism design are analyzed

and the multidimensional cubic data model and its knowledge database based on the principle of data mining are proposed. According to function analysis

the knowledge database is composed of solid layer

method layer and innovation tool base

it is easy to query. Based on the formation of innovation scheme

the data-mining system construction of knowledge-database solution and its decision tree arithmetic are introduced. Finally an example is given to illustrate the process of the knowledge-database solution.