Menstruation is life process in which female productivity begin to operate because of developments in the ovary functionings. It is a special instance indicating that the reproduction is not taking place. The objective of this project are to determine and compare the anaerobic stregth in females in the menstruating and non- menstruating periods, to determine the difference between them ,and to inform the general sports community about this issue with scientific and reliable information . The project was undertaken at the School of Phyisical Education and Sport at Selcuk University. Thirty female students were selected as subjects from among those who have their menstruation without or little pain and whose avarege age , weight and height are respectively 19.66 yıs, 56.33 kg, 164.6 cm. The anaerobic stregth averages obtainedin the Wingate test were compares with the ‘t’ test .While differences were obseved between parametres belonging to the two periods, these differences were meaningful from a statistical pointof wiew. As a result, because of the smilar findings in the menstrual and normal periods, no ngative effect on anaerobic strength of the menstrual period has been detected.