南戈壁省是國家預算收入的主要來源。該省的經濟增長增加了其公共投資預算和項目數量。但是它在投資的計劃過程中仍然沒有效率。本研究將根據理性選擇理論,探索並定義投資失敗的原因和情況。從研究人員的角度來看,有一些主要的影響因素降低了投資效率,其中包括豬肉桶和滾滾政治工具的失敗以及政客和選民的私利。 因此,該研究將在2018-2019財年公共投資項目和替代方案中完成成本效益分析。可以評估其公共投資的有效性。它還負責採訪計劃過程中的重要利益相關者。最後,描述了投資有效性評估結果與訪談之間的關係。這種關係有助於更新相關的政策和行為,設定更有效的投資項目。避免人員個人利益也很重要。 The South Gobi province are main generator of state budget revenue. Economic growth of the province increases their public investment budget and number of projects. But it has still inefficiencies in planning process of the investment. This study will explore and the reasons of failure and the circumstances of the investment according to the rational choice theory. In researcher's point of view, there are some main influences decrease effectiveness of the investment that pork barrel and logrolling political tool's failure, and politically and voter's self-interest. Therefore, the study will accomplish cost-benefit analysis in 2018-2019 fiscal year public investment projects and options. It may assess their effectiveness of the public investments. It also handle to interview with important stakeholders in the preparation procedure. Lastly, it describes to the relationship between the result of evaluating the potency of the investments and interviews. That relationship leads to renewal related policies and acts, define more effective the investment projects. It also present that importance of avoiding their personal self-interest.