【摘要】In the paper,the authors estimate the consumption-based capital asset pricing model with internal expected utility of habit formation or local durability—Constantinides model by Generalized Method of Moments (GMM),and conclude that,(1) tests of overidentification show that the estimated models can't be rejected at normal significance levels;(2) rational investors who are risk averse become irrational who are risk-seeker after June 2001;(3) the representative investor's intertemporal preferences show the property of their habit formation in the bear markets,but display their local durability in the bull markets.