Abstract: Combined with occurrence characteristics of Zhalainuoer Mining Area Ⅱ_3b2 seam,theoretical analysis and field measurement combination method is used to evaluate top coal cavability from 5 aspects of physical and mechanical parameters of coal,top coal fracture features,burial depth,seam partings distribution,caving height ratio. Studies have shown that uniaxial compressive strength of Ⅱ_3b2 coal was 14.73 MPa, caving angle was about 90 °,the angle was greater than reasonable collapse angle;the coal seam was vertical joint development, flaky,easily destroyed under pressure, which was in favor of top coal caving in time; partings were mudstone,the strength was less than seam,and most of the coal seam partings in the upper coal seam, which had less impact on top coal cavability.Based on the above analysis, top coal caving cavability of Ⅱ_3b2 is good, which is suitable for the adoption of caving mining technology.