The invention provides an index change traceability and prediction method and an apparatus. A Granger graph model established in advance is taken as a searching base. Each node in the Granger graph model corresponds to one index and any one edge between the two nodes is used for expressing a causal relationship of the two nodes. The edge points to a result node from a reason node. Through the model, the causal relationship between indexes can be presented. Under the condition that an index change is known, through the node corresponding to the changed index, traceability is performed on a direction of the reason node of the node so that a reason that the index changes is inquired. And prediction is performed on a direction of the result node of the node so as to predict the index which may change.