［Objective］To investigate the effects of intermittent rainfall conditions on the pore structure and aggregate turnover in the black soil topsoil.［Methods］Black soil topsoil was studied using a combination of rare earth element tracer method，artificial rainfall simulation，and CT scanning research method. The aim was to elucidate the responses of topsoil aggregate characteristics，turnover characteristics of topsoil aggregates，and topsoil pore characteristics to rainfall intensity and frequency.［Results］Under intermittent rainfall conditions， isolated pores were concentrated in the topsoil layer. With the increase of the number of rainfall events，the connected porosity was always greater than the isolated porosity at a rainfall intensity of 40 mm/h，and the maximum values of connected porosity and isolated porosity alternated at a rainfall intensity of 70 mm/h. For large aggregates，as the number of rainfall events increased，the ability of 5-2 mm aggregates to break up into 0.25-0.053 mm aggregates decreased when the connecting porosity decreased，while the ability of 5-2 mm aggregates to break up into <0.053 mm aggregates increased. The opposite was true when the connectivity porosity increased. For small aggregates，as the number of rainfall events increased，the ability of 0.25-0.053 mm aggregates to break up into <0.053 mm aggregates increased，while the ability of <0.053 mm aggregates to aggregate to form 0.25-0.053 mm aggregates gradually decreased.［Conclusion］With the increase in the number of intermittent rainfall，isolated pores tend to concentrate in the topsoil layer. Meanwhile，the ability of large aggregates to break up into small particle sizes gradually increases，while the ability of small aggregates to form large aggregates gradually decreases.