In this study, we aimed to investigate the effects of three months of aerobic exercise on physical fitness, body composition and some blood parameters in sedentary Female. 45 sedentary Female with an average age of 36.11±1.04 years, high of 158.9 ±0.76 cm and weight of 70.83 ±1.67 kg have been selected. Sedentary Females were trained through an aerobic exercises programmed one hour a day for three days a week. The aerobic exercise time was on 12 weeks. Setting-up exercises and training in each training session were arranged in such a way as to make each woman’s heart rate to between a levels of 130-140 beats per minute. Statistical analysis were done with Paired-t test, Variance analysis and Scheffe tests. At the end of the three months exercise programmed, a decrease of %9.06 in body weight, %9.96 in systolic blood pressure, %6.94 in diastolic blood pressure, %12.42 in total cholesterol, %22.44 in Triglyceride, %21.16 in low density lipoprotein and %21.4 in fat content ratio have been registered. However, there were increases of %26.22 in hand grip power, %63.83 in the maximum oxygen transfer, %6.2 in aerobic strength and %16.34 in high density lipoprotein. Even though the three months exercise has produced significant effect to on systolic blood pressure, jumping, high density lipoprotein cholesterol, Apo-B, Triglyceride, Hip circumference at .01 level. On number of heart beats, hand grip power, waist circumference, the maximum oxygen transfer, Low density lipoprotein cholesterol, Apo A I and fat contents, diastolic blood pressure and aerobic strength at .05 level. Conclusions: The result of three months low intensity aerobic exercises have shown the fact that such exercises could improve high density lipoprotein cholesterol values and physical fitness. Also by the changes of body fat, Triglyceride, total cholesterol and low density lipoprotein cholesterol values parameters it reduces body parameters. The risk for cardiovascular problems are reduced on sedentary females. Aerobic exercises programmers may be recommended to reduce hypertension, weight loss, diabetes, cardiovascular diseases or metabolic diseases on sedentary females between 130-140 heart rate.