In order to further study the influence of blasting cut height on the collapse effect of frame structure with small height-width ratio,ANSYS/LS-DYNA finite element software was used to establish the model of reinforced concrete frame structure with common joints.According to the collapse angle theory,the collapse angles were set as 20°,25°,30°,35°,35°(loose blasting) and 40° respectively.The collapse effect of the structure under six different blasting incisions was simulated,and the numerical simulation results were imported into the post-processing software LS-PREPOST for processing.The time interval was one second,and the vertical collapse speed of the structure was less than 200 mm/s as the completion time of the collapse,and the comparison was made with the actual engineering.The results show that with the increase of the blasting cut height,the accumulated energy is more,the recoil distance of the structure is also increased,and the growth rate is on the rise.The height of blasting pile is inversely proportional to the height of blasting cut and tends to be stable with the increase of cut height.For similar projects of blasting demolition of frame structures with small height-width ratio,excessive blasting cut height should be avoided as far as possible,and the appropriate elevation angle for blasting cut the should be between 30° and 35°.