[Objective] The ecological restoration effects of cultivated land on grain yield and soil heavy metal content were explored in order to provide a certain basis for the decision-making of cultivated land sustainable utilization.[Methods] Taking Tianjin City as a case study

a system dynamics model of cultivated land ecological restoration (CLERSD) was constructed by using system dynamics method. Six scenarios were set under of three strategies:green development

sustainable development and ecological restoration strategy. The deployment of cultivated land and ecological land in Tianjin City from 2016 to 2030 was simulated under different land use patterns.[Results] In the green development strategy

although increasing the use of chemical fertilizer and pesticide could increase grain yield in a short time

it was not beneficial in the long term

and more cultivated land would need ecological restoration because of damage. In the strategy of sustainable development

increasing investment could increase grain production and promoted sustainable agricultural development. Increasing sewage irrigation could meet the demand of crop growth water in the short term

but it would lead to the increase of cadmium content

as a result

more arable land would need to be converted to ecological land. In the strategy of ecological restoration

planting the plants with strong metal enrichment ability could rehabilitated the damaged cultivated land in a relatively short time

and reduced the content of heavy metals in soil and increased the area of cultivated land.[Conclusion] In agricultural production

it is possible to maintain food security and sustainable green development of agriculture by changing the input of pesticides

fertilizers and capital investment

reducing sewage irrigation and ecological restoration of cultivated land.