The dew point analysis instrument in Hebi coal chemical methanol project in the Henan Energy and Chemical Group was introduced, the instrument components were also introduced, the principle of the sensor was briefly disscussed. The instrument of HMT360 type dew point was introduced, the common problems in installation were analyzed, and the corresponding preventive measures were put forward. The related daily maintenance knowledges in the dew point meter normal operation were introduced, the problems in operation were analyzed, and some useful experiences were provided.