Reply: 1. Daily maintenance of the gas chromatography part  (1) Carrying gas and flow path system: Check the cylinder pressure every day, with a pressure range of 0.5~0.9MPa, generally 0.6MPa. Regularlly check molecular sieve filters and traps for clogging, which can cause pressure fluctuations or increases. Regularly use leak detection fluid to check carefully, determine the location of the air leak, and re-tighten or replace the new pressure reducing valve. (2) Chromatographic column: Remove the oxygen from the carrier gas when using the column, especially the polar column, Be careful not to mix with air when changing the cylinders, A helium purifier can also be installed in the gas flow path. 2. Daily maintenance of mass spectrometry (1) Mass spectrometer vacuum leak detection and tuning: The tuning of the mass spectrometer is to obtain good mass spectrometry data, and the vacuum leak detection and tuning of the mass spectrometer must be performed before the sample test. (2) Replace the mechanical pump pump oil regularly. (3) Clean the ion source regularly.