| Background: In recent years, food safety issues have been a worldwide public health concern. Governments all over the world took the control of pathogenic micro-organisms and hazardous chemical contamination in food and reduction of the incidence of food-borne disease as the important target of ensuring the food safety. In order to formulate the standard that both is suitable for Chinese conditions and in accord with international rules, then effectively protect a great number of consumers health, we must take full advantage of China's basic data on food contamination and foodborne disease prevalence.In the aspect of the chemical contamination, as early as the 1970s, WHO and the United Nations on the Environmental Protection Department (UNEP) jointly launched the "Global Environmental monitoring planning / food contamination and monitoring of projects", the purpose is to monitor the levels and trends of contamination. Then some developed countries have also established a fixed and relatively perfect monitoring network to collect basic data.In the aspect of the food-borne pathogens pollution, the U.S. CDCbegan a food safety monitoring network of food-borne pathogens in five major states in 1995 including: Listeria monocytogenes bacteria, Salmonella, EHEC O157H7, Vibrio cholerae and Yersinia , they can found that contaminated food and timely send warning through monitoring system, and publiced food safety information in timeU.S. Food and Drug Administration (FDA) also played a positive role in the national public food safety education regularly published the food safety warning message to the public on the website.All the while, formulating the legislation on unsafe food, clearing away unsafe food in market and carring out the projects certificated by relative department, all of which were took as the basis of China food safety supervision. These traditional practices can not make a timely and rapid control on existing and possible risk factors due to the lack of preventive measures. So we must establish a set of new way to evaluate and reduce foodborne disease outbreaks, while strength the evaluation on risk factors such as the food-related chemicals, microorganisms, and the new food-related technician, thus gradually establish China's own food safety evaluation system, and constantly improve in practice.China should adopt internationally accepted means to create a food safety evaluation criteria as soon as possible, and gradually establish and improve food safety evaluation system, including: timely and appropriately conduct risk assessment on the incidence of the food safety, so as to provide the basis for formulating the international and the national standards and laws; collect the data on food-borne diseases and toxic chemicals in food in nation. Timely and promptly collect the risk assessment information on food-borne diseases, food pathogens and toxic chemicals from other countries; enhance the effective exchange of these relative information and data.With the support of Ministry of Science and Technology in 2002, the China CDC have accomplished the national 15th science and technology research projects - "food contamination monitoring and evaluation of health effects "And" food-borne disease surveillance technology of ", both of which are parts of Food safety key technology research, initially established the food contamination and food-borne disease network which connect with the international level.With the development of the national food contaminants and foodborne disease monitor network, continue to strengthen the monitoring, analysis and risk assessment on potentially harmful chemical contaminants, food additives and pathogen, and made some significant progress and outcomes. Through the monitoring of heavy metals, pesticide residues, and other serious harm ful substances, basicly took control of the China's food contamination status and conduct risk assessment on the pollutants (heavy metals, pesticide residues), put forward prevention measures a focused on health-risk management , and established a early warning system of food supervision and management.Objects:To establish a food safety risk assessment system through continuous dynamic monitoring the main kinds of food in the Shunyi district production, so as to find out the residues level of chemical contaminants and pollution status of foodborne pathogens of table food, then to analyze potential food safety problems, promptly and effectively sent early warning and deal with these problems, meanwhile establish a unified and coordinated food safety information platform, minimize the risk as possible as we can, in order to fully enhance the efficiency of food safety supervision.Methods: This study included two parts; one is that chemical contaminants monitoring system, and another is that pathogenic bacterium monitoring system. The samples collected from some big cultivated base of vegetable and fruit, large shopping and 22 Catering units which included five official hotels serviced for Olympic games, Monitoring sites covered 19 villages and towns area, 818 samples were tested in heavy metals, pesticide residues, food additives and pathogens.Results: 1.78 samples were tested in heavy metals lead, cadmium, mercury, included grain, vegetables, fruits, and other samples; only a few of samples exceeded the limit.2. 38 samples were tested in pesticide residues, included vegetables, fruits, and other samples, none of all is detectable.3. 35 samples were tested in food additives, sweeteners, preservatives, artificial compositive colorant and sulphur dioxide, included juice drinks and pumpkin seeds, Pumpkin seeds were at a higher sulphur dioxide residue level, and other samples were negative.4. 700 samples of table food were tested in pathogens, included the coliform bacteria and 9 kinds of pathogens, the monitoring showed that: the table food was subjected to coliform bacteria contamination, the rate of negative samples was 73.0%, and lower rate at fresh fruit and vegetable juices and cooked meat products . 18 sample positive pathogens were detected, including 16 Staphylococcus samples and 2 Listeria monocytogenes samples.Conclusions:1. The samples, including grain, vegetables, and fruits in Shunyi District were contaminated by heavy metals and pesticide residue, were not serious; the result was satisfactory.2. The table food in the restaurant existed potential risks, it was necessary to enhance supervision and monitoring, and control food contamination to ensure food safety.3. To establish the food safety assessment system, timely analyze the food safety status, and minimize potential food safety risks for fully enhancing the efficiency of food safety supervision.
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