本研究以國內於2002年至2006年宣告進行分割的公司為樣本，以母子公司董監事同名比、母公司對子公司的持股比、母公司銷貨給子公司、母公司向子公司進貨、母子公司的產業異同等變數來衡量母子公司之間的關係強弱，探討母子公司的關係強弱是否會影響母公司分割後的績效。
我們預期當子公司的董監事在分割後仍然有很高的比例來自母公司的董監事；母公司在分割後仍持有子公司大量的股份；分割後母公司仍向子公司銷貨或進貨，顯示了分割後子公司仍受到母公司的影響及控制，母、子公司之間存在著緊密的關係，則市場上對於此分割會抱持負面的看法，對於母公司長期的營運績效也有不利的影響。另外，根據分割能為公司創造價值的假說，認為若公司將不相關的業務分割出去，則公司的業務會越趨於集中，使管理者全力發展核心的業務，故能有較好的營運績效。故我們預期當母子公司產業不同而宣告進行分割，可以改善母公司長期的營運績效。
實證結果發現母子公司董監事同名比率、母公司銷貨給子公司的比率、母子公司為同產業皆與累積異常報酬率間有顯著的負向關係，即母子公司的關係越強時，則市場對於此分割抱持著負面的看法，故對於股價有越不利的影響。而實證結果也發現了母公司持有子公司的股份、母公司向子公司進貨的比率皆與資產報酬率及股東權益報酬率間呈現顯著的負向關係，即當母子公司的關係越弱時，則分割能改善母公司的經營績效。

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