Parkinson's disease and Huntington's disease are two typical brain movement disorders, both of which have been studied extensively for decades. Dysfunctions in the basal ganglia-a group of sub cortex nuclei in vertebrate brains-are generally considered to account for these two diseases. But what will happen if a robot gets Parkinson's disease or Huntington's disease? Based on the concepts in behavior based robotics, this paper studied the behavior patterns of a real robot when it suffers such two diseases. The experiment results showed that the sick robot exhibited some symptoms of Parkinson's disease or Huntington's disease to some extent. This study made explorations to mimic high level brain functions and casted light on designing more intelligent behavior selection methods in the future.