本研究主要從臺灣上市公司，探討企業營運內產品多角化程度對企業經營績效的影響性；將經營績效的財務指標，以複迴歸分析從為收益性、成長性與現金流動性等三方面來分析：
一、收益性：多角化程度在全部公司、非電子業公司、高度多角化與中度多角化公司，均有顯著性影響。公司的收益性綜合指標越高，經營績效越佳，企業於營運內，產品多角化程度對收益性有顯著性影響。
二、成長性：多角化程度在中度多角化公司，有顯著性影響，但是影響較弱。公司的成長性綜合指標越高，經營績效越佳，企業於營運內，產品多角化程度對成長性有顯著性影響。
三、現金流動性：產品多角化對現金流動性對經營績效無顯著性影響。
由本研究中驗證，在企業內於同一企業體內不同事業部間，因共同資源之流用而使資源之利用效率極大化，產生相乘之效果，多角化程度對於企業的提升獲利、持續擴展規模，均有顯著影響。整體上，產品多角化策略是能提升企業的獲利與成長的營運績效。

The research objectives of this thesis are to find out the relationship between three level of diversification and performance.
This study was mainly sampled the financial data of the listed companies from the Listed Companies of Taiwan’s Industry. The financial indicators of operating performance into three respects of profitability , growth rate, and cash- flow, as following:
1.Profitability: The corporate diversification of products effected corporate profitability was significant in all firms , electronics firms and middle diversificated firms.
2. Growth Rate: The corporate diversification of products effected corporate profitability was significant in intermediate diversificated firms , but its effect was weak.
3.Cash Flow: The corporate diversification of products effected corporate cash flow was not significant.
To analysis data using Multiple regression Models and the results showing: Among different divisions in the structure of the same enterprise, firms benefited from circulation of common resources and enabled to utilize. This study was verified that the strategy of diversification could make more profits and growth of firm on operating performance.
Therefore, the Conclusions showing the different strategies of diversification enterprises does not only impact manufacturing performance significantly but also impact financial performance.

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