This research refined the notion of attitude based on the reasoned action perspective of organ donation research at both the conceptual and the operational levels in the Chinese context. In Study 1, a multidimensional attitude scale was developed based on the salient beliefs of the Chinese toward registering to become an organ donor, and the scale's reliability, convergent validity, and discriminant validity were established. The results of Study 1 indicated that the attitudes toward registering to become an organ donor consisted of two statistically independent dimensions, namely, positive and negative attitudes. In Study 2, the predictive validity of the multidimensional attitude scale was confirmed, and the results indicated that negative attitudes, positive attitudes, and subjective norms significantly impacted behavioral intention, which, in turn, predicted organ donor registration behavior.