Abstract: Some of arguable problems in Economic Evaluation of RERRP (reconstruction-expansion and renova-tion-reformation projects) are discussed and put up authorial's opinions which are that: Decision making of in-vestment may be according to incremental evaluation indexes don't necessitate to calculate indexes of afterRERRP. The data of economic evaluation of RERRP may be divided into five groups and every group ofthem has own's usage. As two examples explained calculating method of capital investment and depreciation-Analyzed capital sources for loan payback. Put up the settlement method about that when with and withoutproject have different economic life.