Low urine after doing hemodialysis in nephritis is related to residual renal function and hemodynamic changes. 1. Nephritis patients enter hemodialysis, indicating the occurrence of progressive decline in glomerular filtration rate, reduced residual renal function, excretory dysfunction, manifested as urinary oliguria, edema, elevated creatinine, urea, and so on. With the prolongation of hemodialysis time, the residual renal function is getting less and less, and ultimately there can be little urine or even no urine. 2. Different doses of ultrafiltration are carried out in dialysis, blood volume is relatively reduced, renal blood flow is reduced accordingly, so oliguria occurs; at the same time, with the gradual decrease of creatinine and urea after dialysis, plasma osmolality decreases, which can also be manifested as a decrease in urine output. For those who have less urine after hemodialysis for nephritis, it is recommended to communicate with the doctor of the hospital where dialysis is done in time, and the doctor will give the suitable treatment plan after evaluation.