Abstract: The rib spalling is one of the main factors restricting the safe and high efficient mining of fully-mechanized top coal caving mining of loose and soft coal seam. Taking the Ⅱ927 working face as the research object, numerical simulation, theoretical analysis and field test were carried out for analyzing the mechanism of rib spalling and the control technologies, putting forward the control principle and control ways for rib spalling, and determining the control scheme and reasonable parameters, which include the adjustment of the supporting working resistance of working face, mining height, working face advancing speed, water injection measures. With the purpose to provide a better theoretical guidance for the production practice in fully mechanized top coal caving mining face of soft and thick seam, and also for other coal mining areas to exploit the coal seams with similar condition in the future. Keywords: soft and thick coal seam; fully mechanized top coal caving mining; rib spalling; numerical simulation