Abstract: A material on hand checking method without demands and production orders aims at resolving the problem of not able to forecast material shortage without demands and production orders in electronic format by enterprises. Through the calculation method, when there is a request of trial-producing (trial-running) without any demand and production order, the Enterprise Resource Planning (ERP) server is capable of controlling and monitoring the inventory system, estimating required materials of trial-run prototype/module based on certain steps and procedures. Enterprises can, therefore, decrease overstock in the facilities, reduce the risk of material purchasing and increase profit margins.