Abstract: Based on the analysis of the abundant sedimentary indicators of the thick coalbeds in three coal-forming faulted basins on the Massif-Central of France, the distinct accumulation pattern of thick coalbeds and sedimentary conditions are discussed.A new formation mechanism for the intramontagneous thick lacustre coal (peat) accumulation model is demonstrated.The subaquatic gravitary current transported the organic (peat) and inorganic clasts formed in lakeshore swamp were formed in active clastic environment, and were associated with various gravity-influenced mudstone and sandstone interlayers.The new thick coalbeds accamalation model can provide reasonable interpretation to genesis of the intramontagneous thick coal beds.