<p>The flame fluctuation is closely related to combustion stability. The pattern of flame fluctuation is generally analyzed from the perspective of the overall flame. However, premixed flames exhibit obvious regional phenomena and are generally divided into reactant zone, reaction zone, and product zone. At present, there is a lack of analysis on the fluctuations of premixed flames in various zones. The classic Bunsen premixed flame is taken as the research object. The flame fluctuation in different zones is studied using the probe with different biases. Research shows the fluctuation power in the reaction zone is the highest and shows an increasing trend with the increase of equivalence ratio. But there is no obvious pattern in other zones. Compared with the detection results of digital image technology, only the fluctuations in the product zone have obvious periodic characteristics. This reflects flame flickering and the electron response to flame flickering is more obvious. The flickering frequency detected by the probe and digital imaging technology follows the same pattern with the equivalence ratio. The flickering frequency detected by the probe is slightly higher than that of the digital imaging technology. In the lean combustion state, the probe can more easily achieve flickering frequency than the digital imaging technology. The probe current signals in the reaction zone and reactant zone do not have obvious periodicity but have rich frequency components. The weighted average frequency of positive ion current signals in the reactant zone and reaction zone shows a decreasing trend with increasing equivalence ratio, while there is no clear pattern in the electron current signal.</p>