Background and purpose: Kidney transplant is the most cost-effective strategy in treatment of patients with kidney failure. But allograft dysfunction is still discussed as one of the main problems in these patients. The aim of this study was to identify the factors associated with the development of complications after kidney transplant. Materials and methods: This correlation- descriptive study was performed in kidney transplant recipients (2002-2006) in Mashhad Imam Reza Hospital. Data was recorded in a researcher-made check list including type of dialysis, history of dialysis, cause of kidney disorder, donor kidney anatomy, parathormone hormone level, and complications after kidney transplant including length of hospitalization, urinary infection, and post-renal transplant diuresis. Results: The results showed relationships between age of recipients and wound infection, donor kidney anatomy with lynfocel, deceased or live donor with length of hospitalization, and post-renal transplant diuresis with acute tubular necrosis. We found relationships between history of transplant with length of hospitalization, lynfocel, and acute tubular necrosis. Also, a significant correlation was found between history of dialysis with length of hospitalization (B=0.153, P=0.002) and acute tubular necrosis (B=-0.137, P=0.002). Moreover, there was a significant association between parathormone hormone level with length of hospitalization and post-renal transplant diuresis (B=0.473, P= 0.004 and B=0.398, P=0.011, respectively). Conclusion: Old age recipients, high frequency of dialysis, low level of parathormone hormone, deceased or live donor, and donation of right kidney were amongst the main factors in development of post-transplant complications.