In order to effectively prevent from the risk and control the safety of meat food

and to improve the present situation of meat food safety

the key elements of meat food safety warning are determined as the first grade indexes

which are the supply chain quality of raw materials

production and processing

transportation and storage

quality of sales meat food

as well as market monitoring and management. A warning index system is also derived on the basis of supply chain of food security

and the classical domain and the joint domain of the indexes determined. The extensive prewarning model of the supply chain safety of meat food is proposed and the goal of food security achieved

which may be helpful for proposing the risk strategy of meat food safety by using the Extenic change methods. A modified example shows the feasibility of the method.