The invention discloses a method and a system for judging that the maximum value of energy intensity cycle statistics exceeds a limit value. The method comprises the following steps: acquiring a datablock of a metering device through a master station of an energy metering management system, and reading the maximum value of daily energy intensity cycle statistics and the maximum value of monthly energy intensity cycle statistics of the metering device in the data block; confirming that the maximum value of daily energy consumption cycle and monthly energy consumption cycle is less than the corresponding preset threshold; calculating the ratio of the maximum monthly energy consumption period to the user's standard energy consumption per second, and comparing the ratio with the preset ratiothreshold; If the ratio exceeds a preset ratio threshold, judging that the maximum value of the energy consumption intensity period statistics of the metering device exceeds a limit value; According to the comparison result of the metering device, the method and the system analyze whether the user has abnormal energy consumption and whether the on-site related device needs to be adjusted to avoidpossible failure.