Food flavors are one category of food additives, which account for a quarter of the worldwide market for food additives. The development of food flavors has been influenced by many factors in recent years. These factors can be divided into two classes: technological factors and social factors. The former includes techniques of separation and extraction, techniques of equipment analysis and biotechnology, the latter includes psychological requirements of consumers and requirements for sustainable development. Affected by these factors, sulfur-containing flavors have developed to be one impact category of food flavors, which are featured by active chemical reactivity, low contents in food, low threshold values and distinctive characters, and the market of natural flavors is growing steadily. The status of the development of these two classes of flavors has been introduced and analyzed briefly.