This is an observational study of patients with lupus nephritis aiming to find biomarkers that can predict patients' response to immunosuppressants. We planed to collect 100 lupus nephritis patients' peripheral blood,kidney tissues and urine before and after treatment (mycophenolate mofetil or cyclophosphamide, in combination with glucocorticoids). Then multi omics analysis, including single cell RNA-seq, ATAC-seq and CITE-seq, will be performed to find new biomarkers for patients' response and prognosis.