Natural gas is the main energy source used in people's lives, a odorless gas that is often used as an important gas resource in daily life. Due to the fact that natural gas is a gas free substance, leakage in daily life can easily lead to poisoning incidents or explosions. In order to enable people to detect natural gas leaks in a timely manner, odorization treatment has been carried out on natural gas in civilian gas supply, so that natural gas can be detected in a timely manner if there is a leak during use. If natural gas leakage is not detected in a timely manner, it poses a great threat to people's lives and property. To ensure the safe transmission, distribution, and use of natural gas, as well as the safety of natural gas users and maintenance, Shanghai Reaflow has developed a portable natural gas odorant ultraviolet analysis system to analyze and evaluate the content of tetrahydrothiophene added to natural gas pipelines through the analysis system.