Section four shows the study of the economic effect evaluation on the extend project of the liyujian power plant . a economic effect evaluation is a core material of evaluating investment projects, in which the indices being used is also very important as they represent the economic degree of the project . indices of invest return circle, invest return rate, net present value, net annual value, internal return rate, external return rate, sensitivity analysis are used in this project and the conclusion that the project brings both satisfactory economic benefit and significant social payback 經(jīng)濟(jì)效果評(píng)價(jià)是投資項(xiàng)目評(píng)價(jià)的核心內(nèi)容,而經(jīng)濟(jì)效果評(píng)價(jià)的指標(biāo)又是非常重要的,它們從不同角度反映項(xiàng)目的經(jīng)濟(jì)性,本文選擇了投資回收期、投資收益率、凈現(xiàn)值、凈年值、內(nèi)部收益率、外部收益率、敏感性分析等指標(biāo)進(jìn)行了定量分析及評(píng)價(jià),并得出了結(jié)論:擴(kuò)建工程項(xiàng)目不論社會(huì)效率,還是經(jīng)濟(jì)效益都是很好的。