The study was implemented at the street food business in Lai Chau town. Study period was from 5/2010 to 7/2010. Study subjects were vegetables, fish and products of fish, and meat.

The applied techniques included the tested food sampling techniques in accordance with the regulations of FAO - 1988. The sampling techniques cultivated bacteria to determine bacteria /1g finished product: According to the routine of FAO, determining E. coli in the foods (According to Vincent method), testing rapidly the plant protection chemicals, a group of  organic phosphate and carbonate in vegetables, fresh fruits.

Research results showed that the polluted rate of E coli in the food: the overall infection rate was 38%, on fish and fish products was over 40%, meat and meat products was 34, 3%, boiled vegetables was 40%; the highest level of E coli infections in fish was 165 bacteria, the meat was 28 bacteria, the boiled vegetables was 21 bacteria. Rate pollution of the plant protection chemicals: the overall pollution rate on vegetables was 16.6%. In which, the chemical pollution on leaf vegetables was 15%, vegetables and fruit was 25%, vegetables eaten raw was 10%. The street food business abided by the regulations of hygiene and food safety such as covering-up was 84%, the high table of the abided regulations was 92 %, especially 100% of the business used plastic bags and boxes to package foods. They did not use newspapers to wrap foods.