Abstract: To study the gas distribution law，find the gas accumulation location and prevent gas outburst in stope，we studied a reconstruction technology of gas distribution field in a woking face．By analyzing the gas concentration distribution in the coal face，the expansion principles on the measurement data of gas concentration were given．Meanwhile，three interpolation methods for the reconstruction of gas distribution field were compared，where the bicubic interpolation method can better reflect the gas distribution in the face．Hereby，a field reconstruction method of the bicubic extrapolation data based on binomial fitting of least-squares was presented．Finally，the influence of reducing measuring points on the reconstruction field of gas distribution was discussed，and then the installation principle of the gas monitor was given to reconstruct the gas distribution field better．The results show that this reconstruction method can present an accurate distribution of gas distribution in stope，and is also reliable when the measurement data is reduced．

Key words: gas distribution field, interpolation, least square method, field reconstruction