The purpose of this study was to study the effectiveness of pelvic floor exercises on female urinary incontinent patients by comparision of an ability to control urination between parients who had been practiced and had never been practiced pelvic floor exercises. The methodology was the quasi-experimental design. The variable is the pelvic floor exercises designed by the researcher. The samples were purposive sampling. The study was conducted on new cases of female patients, aged between 30 to 60 years old, who were suffering in mild degree of urinary incontinence and didnt need surgical treatment, in Uro-Surgical service Out Patients Department, Rajvithi Hospital. The sixty subjects were equally assigned into control group and experimental group. The experimental group have been advised on practice pelvic floor exercises but the control group have been provided with the routine service in the ward. The data were collected from the symptom records and evaluating about frequency of urination and urinary incontinence signstable. The analysis was made by using t-test dependent and independent. Theresults were as follows. 1. Patients who practiced pelvic floor exercises had an ability to control urination significantly better than patients who did not practice pelvic floor exercises. (p < .01) 2. In congrol group and experimental group, post-treatment had an ability to control urination significantly better than pre-treatment. (p < .01).