In order to adapt to the rapid development of production control technology and process detection technology in China's food fermentation industry, the Shandong Provincial Institute of Biotechnology has developed a fully automatic reducing sugar analyzer based on the principle of Fehling reagent determination. The instrument adopts complementary color micro automatic thermal titration technology, and various titration conditions are controlled by a microcomputer. The operator only needs to inject a small amount of sample into the reaction tank with an injector to automatically complete the measurement process, and automatically display and print the results. The operation is simple and easy to use, which can greatly eliminate human errors and improve the speed and accuracy of the measurement. This technology is a gap in the research of analytical instruments both domestically and internationally,Obtained national inventionThe application of this technology is of great significance for improving the production and testing technology level of China's food fermentation industry and promoting technological progress of enterprises.