Growth retardation is a frequent finding in patients after renal transplantation. The aim of study is to evaluate the height of patients received renal transplant during a 7-year period of follow-up. 45 children (26 boys and 19 girls) who underwent renal transplantation in Labbafi nejad Hospital in Tehran, Iran from 1997 to 2004 were included. All patients had regular annual follow-ups until 7 years after transplantation. Their data were reviewed retrospectively and variables like sex, age, height, serum calcium and phosphorous, serum level of cyclosporine, type of chronic renal failure, number of acute renal failure attacks, history and duration of dialysis were evaluated. The paired sample t-test and the Pearson coefficient of correlation were used in univariate analysis and multivariate analysis was performed by linear logistic regression. The mean age of samples was 10.8 (SD 2.7) years. The mean standard deviation scores of height (HSDS) before surgery, 1 year, 3 years, 5 years and 7 years post-operation were respectively -3.3 (SD 1.9), - 2.6 (SD 1.1), -3 (SD 1.4), -3.5 (SD 1.4) and -3.3 (SD 1.5). The only significant difference was between HSDS before and one year after operation (p=0.007). The factors affecting the HSDS in 3, 5 and 7 years after transplant were the duration after transplantation and the cumulative dose of corticosteroids. Our results indicate that the early increase in HSDS does not continue in the following years and the kidney transplantation does not improve the final height of patients. The role of cumulative dose of corticosteroid as a confounding factor affecting the growth is important.