The quality safety of agricultural products is one of the key parts for prospering agriculture by science and technolog y strategy of agriculture and rural. In order to study the agricultural food safety problems，applying the systematic evaluation theory and measures，an agricultural food safety evaluation index system，the critical quality chain analysis based on quality loss and agricultural food safety risk assessment and early-warning model are proposed in this paper. The research is close centering on the characteristics of agricultural food quality，following the principle of the quantitative with qualitative analysis methods. These studies involve the sensory quality evaluation，quality chain analysis and agricultural food safety risk assessment，and they are illustrated by the application of good agriculture practice（GAP）in export spinach sites which are put on records in Shandong province.
The paper first gives the research background of the agricultural food safety，reviews the basic concepts，and then presents the idea for the agricultural food safety evaluation research by systematic theory. Beginning with the introduction of the significations and characters related to the system，the concepts of synthetically evaluation are classified，the sort of evaluation scale is discussed，the basic approach the measure toward complex system is presented，and the application idea of the above method is carried out.
Based on the introduction of index system's concepts，procedure，filter method and index stan dardization from the viewpoints of systematic theory，the approaches to determine the weights of evaluation indexes are discussed. For the example of the application of good agriculture practice（GAP）in vegetable sites in China，the evaluation index system is proposed and the weights of the indexes are determined with AHP method.
In order to solve the loss and distortion within the limit of the planar linguistic evaluation information in the application of Good agriculture practice（GAP）on the vegetable sites，this research is illustrated by an example relevant to the agricultural food safety evaluation on six export spinach sites which are put on records in Shandong province. A multi-attribute approach based on panel data and linguistic information is proposed，an agricultural product safety evaluation index system is put forward according GAP stan dard，the statistical evaluation data is gathered form GAP auditors，and the various period evaluation results are aggregated by multi-criteria and time weights to obtain the final evaluation values. Further，improvement of sites can be achieved on the basis of sufficient analysis.
On the basis of process capability analysis in traditional way，the agricultural food chain is regarded as one process network，usin g the basic theory of PERT/CPM，combining the elements of quality loss function，an approach of the critical quality chain analysis and evaluation based on quality loss is proposed. Finally an example about spinach product is given.
For the issues of the agricultural food quality risk evaluation and early-warning management，an analysis approach based on multi-classification discrete choice model is proposed. On the basis of building an agricultural food safety risk evaluation index system，applying the linguistic information processing method，the panel valuation data is aggregated to obtain the integrated evaluation values. The potential variables are extracted by factor analysis method，an ordered logistic model is put forward，and the calculation analysis steps are given. This research is illustrated by an example of export vegetable sites which are put on records in Shandong province.
The development of international stan dard ISO9001，ISO 22000based on the HACCP principle and GAP；furthermore the barriers from various countries have brought the great challenge to agricultural food safety and quality control. The implementation of agricultural food management system is helpful to realize the target of agricultural food safety.
This work analyzes the agricultural food quality safety and risk based on synthetically evaluation approaches and econometric methods under the guidance of systematic theory，which is a practical application in agricultural food safety.
Keywords：Agricultural Food Safety；Synthetically Evaluation；Linguistic Information；Quality Chain；Risk Assessment；Good Agriculture Practice
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