以重庆“烟灰缸案”、济南菜墩案为典型的建筑物抛掷物侵权案件因法院相异的结论聚焦着各类观点。文章从法经济学视角分析影响该类案件侵权责任认定的社会成本因素,认为对所有可能的施害人追究责任下的严格责任和过失责任将导致法律的激励机制偏离社会福利的最佳水平。 With Chongqing “ashtray case ”, Jinan pier case as a typical building throwing material infringement cases due to different court conclusions focused on various points of view. From the perspective of law and economics, the article analyzes the social cost factors that affect the cognizance of tort liability in such cases, and considers that strict liability and negligent liability under all responsibility for the possible victims will lead to the deviation of the legal incentive mechanism from the best social welfare.