The main effects of the ThreeGorges Dam to the resources and ecological environment in the drowned district and near the reservior are thosethat the land resourse is submerged and won't be recovered,natural landscape and cultural resourse are lost and won't be retrieved, factory andmine loss a lot, if rebuilt, a chained evil consequence would occur,slopeslides and collapses could impact the reservior, the reproduction of thefour major housefish would be restrained,the possibility to induce earthquake in the reservior would be made,migrating in exploiting around thereservior would cause various kind of unfavourable consequences, to theresources and ecological environment on upper reaches, soil loss wouldshorten the using time of the reservior, the deposition from the damconstruction would influence shipping, possibility to cause flood disasteron upper reaches would be made, decrease of the fish in variety andnumber, which is accustomed to live in torrent, would be produced; tothe lower and middle reaches, the effect are mainly on floodng and waterlogging prevention, the living of precious water animals and fishspecieses, the fish production at river outlet and near sea district,industry and agriculture from salt water, accumulation and erosion of the seabank at outlet and delta, the shipping at outlet and in down reaches.These effects above mentioned are profound and rigorous, some are insidious, changable and cann't be evaluated in short term. Thus, it is acritical strategy related to the development of national economy and thedestiny of descendants that whether the Three Gorges Dam is constructed,which ought to be considbred cautiously, but never be made the policymaking by few departments or persons.