Since Varnier studied the roentgen pelvimetry for the first time in 1896, Albert was the first author to describe the result of roentgen pelvimetry. In 1944, Colcher-Sussman had first used the rotation ruler during roentgen pelvimetry which gives benefits to minimize distortion and magnification with simplicity to measure for obstetrician. We have been using the Colcher-Sussman pelvimetric method for long time in Yonsei university. Depends on the measuring data of Colcher-Sussman, we decided the outcome of labor either vaginal or cesarean section delivery. Author studied the pelvimetric valvue of Colcher-Sussman method, and analyzed data maternal pelvic shape and fetal presentation along with fetal head circumference correlating to outcome of laber. Among the total 300 pelvimetric patients, there were 57 cases of spontaneous vaginal delivery group, 42 cases of low forcep delivery group, 9 cases of midforcep delivery group and 192 cases of cesarean section group. Result was; 1. With authors experience, when comparing the result of the Cohcher-Sussman data it was helpful to decide the mode of labor in case of difficult labor. 2. In case of pregnant woman with following measurement data, author decided the contracted pelvis and advised cesarean section. a. Pelvic Inlet A-P diameter; below 12.305cm Transeverse diameter; below 12.501cm Total diameter; below 24.866cm b. Midpelvis Transeverse diameter; below 9.72cm Total diameter; below 20.882cm c. Pelvic Outlet A-P diameter; below 7.071cm Total diameter; below 16.758cm 3. In case of pregnant woman with inevitable radiation exposure is necessary for diagnosis, collimate the necessary exposure area with proper condition to eleminate the possibility of fetal radiation hazard is advisable.