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An improved Boltzmann plot method where the intensity is taken as the integral of the experimental spectrum within a special band for a cluster of rotational line of R and Q branches is proposed in the current study.This method aims to deduce rotational and vibrational temperatures using CH radical A2△-X2Ⅱ band emission spectroscopy accurately.In addition, the data relative to the rotation lines of CH(A2△-X2Ⅱ) for both temperatures are assembled.The emission spectrum of CH(A2△-X2Ⅱ) at the inner cone of an acetylene-oxygen flame in a rich oxygen state is recorded and both the temperatures are determined by the method above.The avlues were recorded as 3141 K and 3097 K, for the rotational and vibrational temperatures, respectively.This result reveals that the equilibrium between the rotation and vibration states is achieved.A simple discussion for this method is also provided.