Abstract: In the large full-mechanized caving coal face, there will be the problem of crooked frame in the use of the support, which has a serious impact on the stability and production efficiency of the full-mechanized caving face. In order to meet the needs of increasing production and mining height, the 10303 working face adopts the ZF10,000/23/45D electro-hydraulic support, which is 8 tons heavier than the ZFS7200/20/40 support, the side guard thrust is increased by 60 kN, and the mining height is increased from 3.3 meters to 3.6 meters. However, in the initial stage of mining with this new type of support, the working face has a serious distortion phenomenon, which has a serious impact on production. After summary and analysis, it is found that the main reason is the design of the side protection plate of the support. Through this case.