Abstract:The development processes of embryos and endosperm of trigrain wheat were observed by using paraffin section method and intact dissection. The results were as follows: 1. Fertilization: the development and progression of embryo and endosperm were similar to those as common wheat. 2. The grain come from the primary pistil embryo developed more early among the three-grains. 3. Many abnormal structures, such as Conversion of position between the top and base, back and belly of embryos, horizontal embryos, embryos moved on top, polyembryony and endosperm deficiency etc, appeared in additional pistils. All abnormalities accounted for 88 percent in whole additional pistils.