Abstract: The paper reported the Vc content changing rules in Hippopkae rhamnoides fruits that were taken from the natural forest grown in different geographical production places. Statistical analysis shows that the Vc content is related to the different geographical locations and altitudes of the production place, which obviously affect the Vc content. Before physiological maturity the Vc content in H. rhamnoides fruits increases sharply with the development of the fruit, and decreases slowly after physiological maturity. In the low elevation area of Beijing, it reaches the peak value in the first ten days of July. In the daily changing process, the peak Vc content occurs during 0~3 o'clock, and the content descends to the lowest during 12-15 o'clock. The fruits on the upper part of the canopy have the highest Vc content, while those at the middle part take the second, and those at the lower part have the lowest content. The fruits on the illuminated aspect possess more Vc content than those on the shaded aspect.