To see the effects of preserving perinephric fat on graft survival and complication. In this 3 years retrospective study (from March 2005 to 2008) we compared two groups of recipients .Group A (n= 78) whose perinehric fat of transplanted kidney was not observed (but perisinus fat) during transplantation and group B (n=192) whose perinephric fat persevered. Recipients were compared according to presence of acute rejection episodes significant lymphocele formation (which needed intervention) and graft function (serum creatinine level).Among 78 recipients in group A clinical manifestations of acute rejection (at least during the first three months after transplantation) happened in 23 (29%) recipients and in group B was 68(31%) .Serum creatinine during the follow up of two groups was nearly the same and no significant difference was observed for lymphocele formation (in group A 8 recipients (10%) and group B 18(9%) respectively. Our results show that preserving or not of perinephric fat of transplanted kidney has no significant effects on graft function and complication such as lymphocele formation.