As of now, government's public construction projects cover a total of 23 sub-categories, which are carried out on a case by case basis with no integrated planning. Their feasibility and priority are scrutinized as investment decisions. Although review and scrutiny operations have been strictly implemented via multi-level examination before being handed over for execution, ineffective public construction cases are frequently found, proving that the decision-making mechanism of case by case review and scrutiny has reached a serious bottleneck with inbred flaws. In the authoritarian era of martial law, it could be said public construction investment policy-making process was highly stable and sustainable. With the lifting of martial law, our country entered party politics with rotating governments where voters favor politicians who help their political interests. This irrational process often requires a substantial increase in social welfare spending, public works and capital, in other words, ＂electing a check＂. This easily leads not only to confusion in resource allocation, where politicians, interest groups and officials are caught in the iron triangle between seeking gain and illegal interest, but also produces a resource crowding impact on important public construction investment projects. Infrastructure investment plans need to be smoothly promoted, and require a more realistic compromise. The effectiveness of the government's public works have so far been repeatedly criticized for their investment decision-making mechanism. There is a need for them to be reviewed again: mechanisms are not immutable, and should be reviewed and revised the in step with times. This review is intended as a proposal to the Government, for government reference, for public construction investment decision-making.