Green Infrastructuration(GI) of suburban cropland can help to explore its potential for ecosystem regulation and cultural service value. Additionally,it can mitigate the shortage of urban green spaces and improve green space exposure rate. In this paper,four typical cities,Xi'an,Beijing,Guangzhou and Shanghai,are selected and categorizes them into three circles: peri-suburban,mid-suburban and outer-suburban,based on the buffer distances of 1km,5km and 15km from the built-up areas of the cities. The natural geographic and socio-economic characteristics of suburban cropland in each zone,as well as the current status of GI in the different circles,are systematically analyzed. In addition,this paper constructs an evaluation system for the GI potential of suburban cropland and quantifies its role in the enhancement of urban green space availability. The results show that: (1) The current operation mode of GI varies by city and circle. The service categories are mainly concentrated in sports,leisure and catering services. (2) The number and percentage of suburban cropland included in urban green infrastructure varied significantly among the four cities. The cropland of Xi'an has high GI potential with minimal differences between circles; the convertible cropland in Beijing is mainly concentrated in the peri-urban area,with a low overall percentage; the convertible cropland in Guangzhou is sparse but has a high percentage; while Shanghai features extensive convertible cropland with a balanced distribution between circles. (3) The GI potential of cropland in peri-urban and mid-urban circles has been significantly underestimated. Nature-based Solutions (NbS) guidelines and self-assessment tools should be combined to rationally guide the appropriate development and multi-functional operation of cropland. The level of ecosystem services should be improved on the basis of safeguarding the production function of cropland,which will ultimately promote the sustainable development of urban and suburban areas.