Construction method of database, and dynamic determining method and system of quality of coal as fired

The invention discloses a construction method of a database, and a dynamic determining method and system of the quality of coal as fired. The construction method of a coal quality measurement section stereomodel database comprises the following steps of: under a situation that the layer number and the kind of coal are determined, taking both the layered arrangement of different kinds of coal and the mass percent of each layer of coal as variables; fixing one variable, regulating the other variable in real time, and obtaining the on-line detection mass percent of each ingredient of the coal quality of laminated coal on line; under a situation that the layer number and the kind of coal are determined, according to the theoretical mass percent of each ingredient of the coal quality corresponding to each kind of known coal and the mass percent of each layer of coal, solving the theoretical mass percent of each ingredient of the coal quality of the laminated coal; and carrying out mutual association on the on-line