Abstract: With the analysis on the development obtained from the fully-mechanized mining technology along the strike of the steep inclined seam in China,in comb ination with the typical cases of the fully-mechanized coal mining in the steep dipping medium thick seam,the fully-mechanized longwall top coal mining in the steep dip ping ultra thick seam and the fully-mechanized 4.5 m high cutting mining engineering practices in the steep dipping thick seam,the paper expounded the application effe ct and the sustainable improvements of the hydraulic powered support applied to the fully-mechanized coal mining in the steep dipping seam.The paper concluded and summarized the several major problems to be solved directly affected to the application effect of the hydraulic powered support applied to the mechanized coal mining i n the steep dipping seam.The major problems were including the hydraulic powered support too heavy,poor telescopic side guard plate,the floor adjusted jack hard to b e replaced at the site,the hydraulic powered support hard to be pushed forward with the pressure on the roof and others.The paper proposed the sustained developmen t of the steep dipping hydraulic powered support should be mainly based on the conception of " the temperate working resistance,reliable anti lodging and sliding and li ghtening powered support weight" .Those major problems were innovationally solved with the traditional concept breaking in the improvements. The preparation and con sideration were conducted on the related deep level problems of the sustained improvements for the hydraulic powered support applied to the mechanized coal mining i n the steep dipping seam in order to have wide attention and to coordinatively promote the standardized development of the hydraulic powered support applied to the m echanized coal mining in the steep dipping seam.