【正文】 ese maturity process monitoring, quality control of Swiss cheese flavor mixture pattern recognition and cheese taste detection, and detection of the shelf life of cheese, cheese, another include the detection of microorganisms in milk distinguish different kind of ice cream, online monitoring of yoghurt fermentation. 2001, Italy and other electronic nose to identify two different heat treatment of milk: one is pasteurized, another treated after ultrahigh temperature sterilization. The five different SnO2 sensor array, in response to the data obtained by the sol gel technology to identify the two kinds of milk processing and tracking the dynamic process of milk corruption reactor by principal ponent analysis, be able to tell its good quality The bad and the whole corrupt process, and in the dairy production industry has begun to apply this instrument to go for quality control analysis. The experiment, the sensor has a good repeatability, and the response time is very short, about 2 ~~ 3min. The electronic nose applications in dairy biggest advantage is that you can line control, which can not be pared to any other method. American using a mercial electronic nose system, based on the conductive polymer used for the analysis of beef freshness. Raw data obtained by the electronic nose systems using different signal processing techniques pretreatment, pretreatment data reprocessing to extract the characteristics of the different regions, followed by the use of principal ponent analysis, to further reduce the number of dimensions. Development RBF neural networkbased classification model for feature extraction. electronic nose to detect the Pink Lady brand apple shelf life, results with routine quality testing (hardness, starch index, acidity, etc.) related contrast, showed a good correlation Supriyadi electronic nose of different maturity snakeskin fruit detection, results showed that the electronic nose can be a good distinction。 detect ear, nose and throat infections reach up to 88% accuracy。Amico pointed out that the electronic nose can distinguish between benign skin lesions and birthmarks tumor or melanoma。s Bloodhound. Domestic gas sensor has been developed rapidly in recent years, but pared to the overall foreign advanced countries quite different.Conclusion: Overall, most of the domestic and international electronic nose technology is still in the laboratory stage, even if there are still some problems in mercialization of pro。s latest two technologies solid phase micro extraction and Electronic Nose monitor phenanthrene degradation in contaminated soil. The Philippines is a hydrophobic organic contaminants, contains three fused benzene rings belonging to polycyclic aromatic hydrocarbons. The detection and analysis of the electronic nose results show that, by PCA treatment, contaminated and uncontaminated soil samples can be significant distinction.Public SafetyIn order to ensure the security of public places, check explosives in airports, railway stations, docks and other places is an important and difficult task. These places usually have more staff, speed of flow of people, plex background, more belongings. Therefore, the accuracy of these places explosives, quick detection has bee the focus of the work and difficult. Compared to traditional detection methods, the electronic nose has small size, low cost, and high reliability. . Yinun and other electronic nose for explosives and chemical weapons detection of volatile gases. With polymer coating Iran and other electronic nose sensor array for the war moving analog classification, warning of an impending threat of chemical weapons, people to safely leave the contaminated area. In summary, the electronic nose has a short response time, speed detection, sample preparation is simple determination of the wide scope of the assessment, objective assessment of odor pensate for the description of human sensory ambiguity, subjectivity and imprecision, and gas chromatography plicated shortings. Painstaking research, researchers in various fields from a single sensing element to the sensor array to the image sensor, the electronic nose technology fruitful research results. Many foreign advent of electronic nose products, such as France, Alpha MOS system is mainly used for quality identification products such as meat, coffee, cereals, UK Aroma SCAN system is mainly used for cheese, meat quality testing, there39。s renal function, mental patients appreciate. The electronic nose in another medical application is the detection of cancer. The proposed electronic nose Italy and other noninvasive diagnosis of early cancer of the urinary tract。 application of a precise verification techniques and the detection output of the steps on the selected model. The electronic nose applied to the assessment of the quality of black tea in India Bipan Tudu to do related research. Based on neural network in dealing with the main problems of sensor array data: the quality of black tea, tea from different tea gardens picked by different climatic conditions, farm type, season and planting methods are quite different, and therefore, the entire database can not be readily be met difficult to train a neural network model. The study proposed to enhance the learning characteristics of RBF neural network pattern recognition algorithms to classify the smell of black tea, and get a better recognition effect. In addition, the Task Force also uses an electronic nose to predict the optimum fermentation time for black tea. Wang Jun, et al Zhejiang University to study electronic nose applications in various types of food, such as Longjing tea, wheat, eggs, etc., have achieved better results. Luo Dehan such as China Science and Technology University of Electronic Nose to the counterfeit cigarettes identification, Huazhong University of Science and Technology, Xie Changsheng electronic nose to identify 17 different brands of domestic vinegar.MedicineWith th