In order to improve multi-branched horizontal well production, plugging reasons are analyzed deeply. Plugging mechanism is founded out and yield increasing measures are presented. In the development of multi-branched horizontal well at certain block, due to power outages, equipment failure or improper drainage control, coal seam collapses or borehole get plugged, which result in sharp decline of gas yield. Nitrogen foam plug-releasing is of low cost, small coal pollution, and will not lead to wide-range collapse of the open hole and so on. The process and technology of nitrogen foam plug-releasing to multi-branched horizontal well are studied with site application, which solve the issues of plugging and productivity decline, avoid damage to the coal bed. So it is an effective method to implement nitrogen foam plug-releasing for multi-branched horizontal well.