Three typical farm products storage systems were adopted to detect the temperature drifts respectively. The cell circuit was improved according to the designing principal of the instrument electrocircuit. As the results, the error of the storage temperature was dramatically reduced from 3.5℃ to 0. 3℃ and the cold storage temperature fluctuations decreased from 5.3℃ to 1.4℃. Besides, three simple temperature compensation methods were also selected. These methods were applicable to those places which were unsuitable for the instrument circuit improvement.