The aim of this study was to evaluate the effectiveness of the integration of systematic desensitization of anxiety in pregnant women for childbirth preparation classes. This study, consultation on 76 patients (38 patients per group) of nulliparous mothers attending antenatal classes 22Bahman Hospital in the city Gonabad20th week of pregnancy will be done. This randomized study with a control group without blinding done. How to target qualified individuals and how the study will be explained. The four blocks are divided in two groups and the informed consent form is completed. Inclusion criteria consisted of: Causing the first being about 20 weeks gestational age, age between 20 and 35 years, the same anxiety (STAL score of 20 to 69 in Scale anxiety, including anxiety is mild to moderately severe), lack of medical-surgical diseases ( Blood pressure, diabetes),No history of psychiatric or mental illness, and the normal healthy fetus in the first trimester graphic examination (without any fetal abnormalities, the normal location of the placenta, normal cervical length)،No apparent obstacles for normal delivery at the time of sampling, any contraindications to vaginal delivery, having the symptoms of threatened abortion, have at least read and write, singleton pregnancy, non-smoking, drugs and alcohol, single spouse, Lack of recurrent miscarriage and infertility. Exclusion criteria: absence of more than two sessions, moved, and the unavailability of pregnant women and pregnancy termination for any reason before the end of counseling, the creation of any indication for cesarean delivery. The sample size for each group of 30 is estimated. Including 20 percent chance of attrition number of samples in each group of 38 people considered to be. In addition to participating in the intervention group mothers in childbirth preparation classes for eight sessions is that desensitization techniques used in the class also will (That include relaxation training in first 4 sessions are completely if the mother is unable to properly use this approach to the next stage And the last four sessions that are related to desensitization techniques). Control group will attend classes in preparation for childbirth. Desensitization sessions in the intervention group for subgroups will be 4 to 6 persons. This parallel sessions and will integrate in its class content done. Finally, using the Spielberger anxiety in two groups compared.