Abstract: To master the distribution laws of gas flow fields is the premise of designing reasonable project for goaf gas extraction. Disallowed gas concentration occurred in return Air occurred at 1201-Face in WU Hu-shan mine. So studying the gas distribution was necessary. On the basis of gas emission analyzing, the distribution of gas flow fields in 1201-face under the condition of mining was researched by FLUENT numerical software. The difference of gas emission at the normal recovery and roof weighting periods was rationally explained. And theory basis was provided by the results to design reasonable project for goaf gas extraction. The research conclusion was verified scientificly and reliably by the field measured results.

Key words: goaf, gas flow fields, roof weighting, different-source prediction