Abstract: After the use of cutting roof technology, the surrounding rock structure of retaining roadway forming rectangular region takes on the "leading" role in support system. We propose the technology of combining self-stable structure theory of rectangular area, establishing cantilever beam mechanical model to analyze and calculate the support parameters, and using anchor and intensive pre-stressed long anchor cable with W steel belt and barbed wire strong support mode. Combined with the engineering example, results show that the reasonable supporting measures of "trinity" can better meet the needs of supporting.