Abstract: In order to obtain input- output adjustment scheme, the authors took counties and districts in Tianshui city as the evaluation units to measure the informatization benefit by establishing rural informatization input-output evaluation index system of Tianshui City and using the C2R model of Data Envelopment Analysis. The results showed that:(1) Maiji, Qinzhou, Qin’an and Gangu County were DEA effective, Wushan, Qingshui and Zhangjiachuan County were DEA ineffective; (2) economic scales of Maiji, Qinzhou, Qin’an and Gangu County were invariant, while that of Wushan, Qingshui and Zhangjiachuan County were increasing; (3) for ineffective DEA counties, the input should be reduced to make the benefits turn to the best state through the model correction.