It has shown that the decrease of blood glucose levels in patient with diabetes mellitus decreases mortality and morbidity rates. Main purpose in diabetes is to achieve and prevent the glycemic control. We aimed to evaluate the relationship between poor glycemic control and metabolic parameters, individual life and complications. Seven hundred fifty seven patients with type II diabetes mellitus have evaluated with demographical characteristic, body mass index, abdominal circumferences, blood pressures, dietary compliances, physical exercise statuses and laboratory analysis; and the relationship of these parameteres were investigated. Poor glycemic control was found significantly associated with duration of diabetes, age of onset, family history, job status, educational status, antidiabetic drugs, body mass index, abdominal circumference, hypertension, lipid and fasting plasma glucose levels. There was a significant relationship between the glycemic control and dietary compliance, physical activity, self blood glucose monitoring and drug compliance. While there is a significant relationship between the poor glycemic control and nephropathy, retinopathy, neuropathy and cardiovascular diseases; no significant relationship was seen in the cerebrovascular diseases and arthropathy. We have pointed the relationship of glycemic control with sociodemographic, medical status, life style, lipid levels and complications. Better results can be obtained by eliminating the factors related to poor glycemic control.