Abstract: The effects of titanium on some photosynthetic functions of the flag leaves and characteristics of wheat spike were studied in this paper. The experimental results showed that the contents of chlorophyll and carotenoid in unit fresh weight or in unit leaf area, PS II activity, the efficiency of primary conversion of light energy of PS II and the efficiency of potential photosynthetic quantum conversion of a leaf from wheat flag leaves were raised by titanium. At the same time, titanium was advantageous to the accelerate of wheat milk course and the increase of per spike grain and one-thousand grain weight. Owing to titanium being able to improve plant photosynthetic. functions and component factors of crop yield, it will have fine prospeets for practical application to argricultural production.