Whether the kidney with severe fluid accumulation can recover its function is mainly judged according to the time of fluid accumulation, the time of severe fluid accumulation is short, it can generally recover, and the time of fluid accumulation is long, it is generally difficult to recover. 1. Short time of fluid accumulation: If there is severe fluid accumulation, active treatment within a short period of time to remove the fluid, basically will not cause damage to the kidney, and the function of the kidney can be restored in general. 2. Long duration of fluid accumulation: If severe hydronephrosis occurs, the duration of fluid accumulation is too long and the symptoms are not relieved, it will lead to thinning of the cortex of the kidney and reduction of glomerular filtration rate, causing irreversible damage to the kidney, and the function of the kidney can not be recovered in general. In conclusion, for severe hydronephrosis, the shorter the duration of hydronephrosis, the higher the possibility of kidney function recovery, and the longer the duration of hydronephrosis, the higher the possibility of irreversible kidney damage and the lower the possibility of kidney function recovery. If you find severe hydronephrosis, please seek medical advice from regular hospitals in time to clarify the cause and treat it actively.