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In this paper, the Extended Self Similarity (ESS) was used to study the scaling exponent ξ(q) of temperature data in the Reyleigh-Bénard convection and its variation with experimental measuring locations. The results show that ξ(q) varies with locations and agrees well with experimental data. And then the wavelet transformation is used to extract the coherent structure, by means of the definition of a called non-coherent signal, we can understand the influence of coherent structure on ξ(q) and the relations between large scale vortex motions and small ones.