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The paper explore the trading strategy of the major institutional investors, and After-hours Trading have impact on performance. The legal person is mostly a professional investor, the information mastery and trend judgment are superior to the retail investors. Therefore, the open interest if the major institutional investors are widely used in the trading. This paper studies used that as a strategy will be profitable in the long term. Under the after-hour trading, foreign investment and day trading both get promotion when transaction time being extends. It suggests that the price after afternoon session could extend the trend of morning session. In open interest option, After-hours Trading could not increase the major institutional investor’s performance. It also suggests that earlier entry could not take the advantage of the price in long term. In the results of the paper, under the interaction of Institutional investor chip, new institution and algorithm strategy, the performance of foreign investment surpasses other institutional investors, it shows that foreign investment has the most influence and precision in lead of tendency, But Taiwan stock index futures was a bull market in Retrospective period, the strategy gain the most profits since the foreign investment hold long-position in long time; It needs more time to prove that whether the structure of the market would have variation or not. |