1. The concept of overconfidence means that the actor has foreseen that his behavior may have harmful consequences to society, but he can avoid credulity, so the subjective psychological attitude towards this result is indirect intention, which means that the actor knows that his behavior may have harmful consequences to society and lets this result happen. 2. Similarity: Consciously, both of them realized the harmful consequences of their actions. And they all foresaw the possibility of this result from their will, and they didn't want this result to happen. 3. Difference: (1) Consciously, they only know the indirect and intentional facts related to crime, while overconfident people don't know the conditions and facts that may prevent the occurrence of harmful results, not only know the social harmfulness of behavior and the basic facts of crime, but also have a certain understanding of other conditions and facts that may prevent the occurrence of dangerous results. (2) Their understanding of the possibility of harmful results is inconsistent, and there is nothing wrong with indirectly and intentionally turning the possibility of harmful results into reality. (3) Their understanding of the possibility of dangerous results is inconsistent. Indirect intention should reach the level of knowing, but overconfidence only requires knowing. (4) In the aspect of will, indirect intention holds a laissez-faire attitude towards the occurrence of harmful results, while overconfidence and negligence hold a fundamental negative attitude towards the occurrence of harmful results. (5) Indirect intention can establish * * * accomplice, while overconfident negligence cannot establish * * * accomplice. (6) Indirect intention belongs to intention, while overconfident negligence belongs to negligence.