Abstract: This paper carrys on a research on selection of reasonable mining method of C409 complex and hard-mining thick coal seam in WangJiazhai coal mine. First, in order to make the selection of mining methods much more convenient, conclude the general application conditions and selecting principles of three thick coal mining methods in the form of table. Second, concretely analyze the bad factors of C409 complex and hard-mining thick coal seams mining which we should especially consider. On the basis of these, make a comparison analysis of selection of C409 thick coal seam mining method and comprehensive evaluation of adaptability. The results show that it is reasonable to select top-coal caving method for C409 thick coal mining under present mining technology, which is consistent with the actual mining method at present. Finally, this paper gives a few of suggestions on some problems that may occur during C409 complex and hard-mining thick coal seam top-coal caving, which serves as a direction for C409 safely and efficiently mining.