In recent years, researches about the controllable group velocity using differerent methods arouse great interest among researchers. With the development of controllable slow and fast light propagation, discussions about the information speed under abnormal light velocity have been reported. In this work, the information speed in ruby crystal and C60 solution under the slow and fast light conditons are discussed respectively. The results demonstrate that, in our experiment, the information speed is smaller than light speed in a vacuum, although the light group velocity may exceed the light speed in a vacuum. This result is in accordance with the causulty.