“…et.al., (2014) thought that virtual water flow related to the grain resulted in negative impact on relevant development and induced to serious threat to food security. In addition, some researchers made relevant explanation on china's grain safety from many perspectives, such as global economy (Zhou, Xin, 2006), optimization (Shea, 2010), cultivated land (Zhang, 2013), economic ecologization (li, Zhang, 2016), macro economy (Xu, lu, Wang, 2016).…”