1) Objective: To determine and Comparison the effect of birth ball and supportive method on labor pain in pregnant women admitted at the physiologic unite of Assali Hospital Khoramabad . 2) Study Design: A randomized controlled trial. 3) Participants in the study inclusion criteria: A person's consent for entry into the study, participated serving an eight sessions classes, physiological childbirth preparation, aged between 35-18 ,gestational age 42-37;primiparous, Presentations cephalic, singleton pregnancy, dilation 3 -4 cm, low-risk pregnancies; Exclusion criteria: Drug addiction, use of sedative and narcotic drugs, use of oxytocin to induce and augmentations of labor, the delivery of mental and medical obstetric disorders, CPD and the lack of progress. 4) Sample size: 93 people in three groups: Birth ball, support and routine vaginal birth (control), 5) Intervention: In all groups, during cervical dilatation 3-4 cm, 7-5 cm and 10-8 cm pain test is measured. In birth ball group during three phases of cervical dilatation during labor to parturient 30 minutes sitting on birth ball 90 degrees pelvic to rocking moves left and right forward and hind ward. In support group to help the researcher during three phases of cervical dilatation by talking with psychological support will associated him for 30 minutes. In control group receive routine care and standard care without any intervention. In all of them groups, Pain intensity with Visual Analog Scale and behavioral pain in cervix dilatations of 3-4, 5-7 and 8-10 centimeter is measured. One time in each period. Intervention time: 90 minutes 7) Main outcome measures: Pain intensity.