隨著全球化發展之趨勢，企業可以藉由有效的供應鏈管理方法，使企業間相互合作與協調提升供應鏈競爭力，而供應鏈管理方法可以有效的將資源整合管理與運用，使其發揮最大效用，減少不必要之成本，提升整體供應鏈之效率。但近年來之研究大部分皆探討需求穩定之產品，但在實際的生活中，企業常面臨需求具有變異或季節效應之產品，如機票、冷氣機等，使得產品需求存在較大之波動，導致企業無法準確地預測需求。透過企業間彼此分享之資訊，將會影響供應鏈間之存貨變異問題，因此本論文將以供應商之角度，探討在具有季節性效應之供應鏈中，進行資訊分享所產生之利益及成本問題，希望找出最佳資訊分享程度，使供應商獲得之利潤最大化。
本研究考量一兩階段季節性商品供應鏈中，具有單一供應商及單一零售商，著重於季節性商品資訊分享對於供應商利益的影響為何，因此資訊分享之行為將由供應商主導，在資訊分享過程中，供應商將協調零售商幫助蒐集市場上顧客需求資訊，且與零售商分享資訊分享利益以作為回報，而對於供應商而言可將此視為共享利益之成本，其中共享利益之成本與資訊分享量成正向關係，而隨著資訊分享量愈高，供應商所能改進之變異程度也逐漸降低，因此供應商藉由資訊分享所獲得的淨利潤為一凹函數，故能藉由此函數找尋最佳之分享程度，使供應商之利潤最大化。
由研究結果發現當前一期需求相關或者前一季誤差相關產生變動時，資訊分享之利益亦會隨之變動，而共享利益成本會隨著資訊分享量改變而變動，因此當資訊分享量愈高時，共享利益之成本也會隨之提升，故最佳資訊分享量會受到資訊分享之利益與成本之影響，使不同的供應鏈有不同的最佳資訊分享量。

This study identifies the benefits of sharing demand information from retailers to suppliers. Previous studies discussed only the value differences between situations with and without information sharing. This study considers a two-echelon supply chain for seasonal goods which has one supplier and one retailer to develop a model to obtain the optimal degree of information sharing. With regard to information sharing, though the retailer must spend related costs on collecting and sharing information, it can reduce the inventory cost for the supplier, and which can thus be the gain of information sharing. Therefore, the retailer would be willing to share information with the supplier and also increase his motivation of collecting information, and the optimal degree of information sharing for the supplier can be obtained through the trade-off between cost and gains. The results show that there is a positive correlation between the optimal degree of information sharing and a correlation between the demands of successive periods. The optimal degree would be affected by the cost of information sharing, and thus different supply chains would have different optimal degrees of information sharing.

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