In China's current economic accounting system, an accounting system revised by UN in 1993, farmland only inflects the income from crops, excluding the loss from polluted farmland resources. This paper, aiming at the undervalued farmland resources and environmental issues in Jiangsu province, analyzes farmland depleted cost, environmental degrading cost and restoration benefits, uses earnings multiplying and pollution loss rate to establish accounting model which is employed to calculate the green GDP based on adjusted farmland resources. The result shows a rising GDP, meaning farmland resource protection better than farmland environmental consolidation. Environmental degrading cost in Jiangsu province sits on top in traditional GDP in a rising tendency, and farmland pollution gets worse. Farmland restoration earnings increment rate lags behind economic development, which needs to improve land consolidation comprehensive earnings. This paper offers references for improving farmland resource quality and protection.