本发明公开了一种地下气化方法,该方法包括:填充一次气化后的地下气化炉的全部或预定部分的采空区;对填充后的所述采空区周边的煤柱进行打孔并气化;将原来地下气化炉一次开采后的采空区进行填充,然后对残留的煤柱进行二次开采,该方法简单,成低,可以借用原来地下气化炉的进气、出气等单元;适用范围广,有效解决了地下气化炉一次气 The present invention discloses a method for underground gasification, which comprises: filling all or a part of goafs of a once-through-gasified underground gasification furnace; performing a series of operations on coal pillars surrounding the filled goafs; Hole and gasification; the original underground gasifier after the first mining gob area to fill, and then the residual coal pillar for secondary mining, the method is simple, low, you can borrow the original underground gasifier intake, Gas and other units; wide range of applications, an effective solution to a gas underground gasifier