SAP originated from system applications and products in the field of data processing. SAP is not only the company name, but also the software name of its product-enterprise management solution. SAP is currently the number one ERP software in the world. In addition, the computer term SAP is also the abbreviation of the principle of stable abstraction. \ x0d \ module classification of SAP system: \x0d\ SAP is the largest enterprise information management solution provider and the largest ERP product manufacturer in the world. Its full name is the system application and product in data processing, and it is also the software name of one of its "enterprise management solutions". The functional classification of SAP [1] includes: \x0d\ FI A/R, A/P, general ledger, consolidation, investment, fund, cash, etc. \x0d\ CO profit and cost center, product cost, project accounting, profit analysis, etc. ; \x0d\ AM Fixed assets, technical assets, investment control, etc. ; \x0d\ SD Sales plan, inquiry and quotation, order management, transportation and delivery, invoices, etc. ; \x0d\ MM Procurement, warehousing management, inventory management, MRP, supplier evaluation, etc. \x0d\ PP factory data, production plan, MRP, capacity plan, cost accounting, etc. ; \x0d\ QM quality plan, quality inspection, quality control, quality documents, etc. ; \x0d\ PM Maintenance and inspection plan, document processing, historical data, report analysis, etc. ; \ x0d \ Salary, travel, working hours, recruitment, development plan, personnel expenses, etc. \x0d\ PS Project planning, budget, capacity planning, resource management, result analysis, etc. \x0d\ WF Work definition, process management, e-mail, information transmission automation, etc. \x0d\ PI SAP integration with other systems; \x0d\ is to provide special applications for different industries. \x0d\ Basic part: R/3 system kernel, database, interfaces supporting various platforms, ABAP/4 tool language, etc. \ x0d \ SAP BW (business information warehouse).