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As a novelty bionic technology, the electronic nose has attracted attention in detection of food and agricultural by-products. Literatures have been reported in the applications of wine, tea, beverage, grain, oil, meat, dairy, vegetables, fruits and so on, showing a well application prospect in food and agricultural byproducts detection by using electronic nose. With the deepening of relevant researches and constantly emerging of new technologies, the electronic nose technology has also been improved. The emergence of new sensor technologies helps to develop electronic noses with completely novelty mechanisms. A more comprehensive detection could be realized integrating the electronic nose with other analytical instruments. A combination of electronic nose and the wireless communication technology, overcoming the limitation that a traditional electronic nose can not be applied to the on-site and mobile environments, expands the scope of applications of electronic nose. This paper aims at making comprehensive discussions and analyses from these three aspects respectively, then summarizing as a reference for the subsequent researches.