Abstract: Based on the present situation of exploited and reclaimed farmlands of the whole China, authors tried to divide into six different exploited and reclaimed regions. Among them , According to the pilot investigation of these districts , authors collected all the necessary data of more than ten years , selected the unified index of the techological economic benefit and used the synthetic evaluation method to assess the technoloical economic benefit. All these results can be used as the important basis for selecting the correct land to exploit and reclaim .At the same time , these results also can be used to work out "The Overall Plan of the Land Utilization of the Whole China".