Since the studies on wireless temperature measurement emphasize too much on the overall design，it lacks the analysis of the operating state of electric equipments as well as the alarm of potential risk with the temperature data. Accordingly，five kinds of alarm methods based on temperature measurement，and their operation principles，functions and realization are first put forward.Furthermore，considering the characteristics of each alarm mode，different setting modes of thresholds are proposed.Besides，a floating threshold mode is adopted for two of alarm modes in order to get rid of failure and false alarm.Finally，a corresponding algorithms are presented for various alarm modes which have been successfully applied in the substation，thus the stability of the alarm mode and algorithm is proved.