The composite zeolites A/X was synthesized by hydrothermal method from one synthesis gel without template. The effects of the ratio of raw material(SiO2:Al2O3、H2O:Na2O、Na2O:SiO2)on the synthesis of composite zeolite A/X were studied by means of X-ray diffraction, the results showed that the zeolites A and X were co-crystallized in a narrow range. TEM analyses indicated that the as-synthesized composite zeolite dispersal well. The calcium ion exchange capacity of the composite zeolites A/X was quite high as zeolite 4A, the magnesium ion exchange capacity of the products was much better than 4A zeolite and the ion exchange capacity for magnesium was increase with increasing content of zeolite X.