Fetal Electrocardiogram(FECG) is an objective index of physiological activity of infants. Nevertheless，FECG is very low and often interfered by Maternal Electrocardiogram(MECG) and other yawp. In order to extract clear FECG，a new method called PICA was proposed based on Independent Component Analysis(ICA) and Particle Swarm Optimizer(PSO). Experiments results indicated that more exact FECG could be obtained by PICA method with high stability and strong robustness than by other methods.