台灣股市投資人是一個以散戶投資人居多之市場。通常股票買賣講「追高殺低」，基本上就是台灣散戶投資模式的最佳寫照。由於一般的股市小散戶，限於人力財力，做投資決策時，並沒有媲美專業法人的投資研究團隊而常居於弱勢。有鑒於此，本研究採用一般人最直接的想法，投資標的就選用「大一點的公司」、「有賺錢的公司」，以這樣的方法來作為投資策略。另外，以「雞蛋不要放在同一籃子裡」之古訓再做一投資組合。藉由將資金以此三種投資組合，投資在台灣股票市場，再做一報酬率績效比較後，選出本研究的最佳投資組合，以提供給散戶投資者一個最佳的投資參考。
本研究實證結果顯示，「雞蛋不要放在同一籃子裡」的平均數-變異數投資法則有最好的投資績效，而與「規模效應」理論相呼應的「大一點的公司」投資策略，及投入於「有賺錢的公司」之「動能理論」投資法亦都擁有不錯的績效。

The old advice for stock market investment is "Buy low - Sell high." In the Taiwan stock market, retail investors do just the opposite.The majority of investors in the Taiwan stock market are retail investors. Because of their limited human and financial resources, their investment position is weak compared to the invest strategy of the professional juristic investor.This paper will detail the professional investment strategies of a "larger and more profitable" professional investment company.Following the advice "do not put all of your eggs in one basket", portfolio diversity is the rule. Looking at three separate investment portfolios we will compare their performance and ROI. This study will then select the best portfolio and provide details of these investment strategies for retail investors.
The empirical results will show that a strategy based on the 'mean-variance principle' will provide the best investment performance. But good results will be obtained by following the 'size effect theory' regarding investments in a 'larger and more profitable company' with the "Momentum Investment Strategy" principle also providing very good ROI performance.

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