中文摘要：

互联网对柠檬问题的经典分析背景产生了一定影响，交易者在网络环境下表现出比传统经济更严重的投机倾向，柠檬问题也随之有恶化的可能。通过说明柠檬问题的产生，推导出其在网络环境下有加重的可能；阐明了双元打分声誉体系的运行机制，分析出其缺陷所在；探讨引入买方质量表现因子的声誉机制效率问题，比较分析了同时引入买卖方质量因子的声誉机制有效性；提出了一个基于声誉机制的解决网上交易中柠檬问题的改进模型。

英文摘要：

The Internet has greatly influenced the classic analyzing background of Akerlof＇ s lemon problems, as dealers tend to have more severe speculative intentions than that in traditional economy, which consequently may lead to the deteriorating lemon problems. The paper firstly stated the worsening possibilities of lemon problems in the Internet environment. Then it specified the operating mechanism of dualrating reputation system and figured out the shortcomings. After that, the author comparatively analyzed the efficiency of dual quality factor involved reputation system and the buyer quality factor related system. It finally proposed a dual quality factors based reputation mechanism solution for online lemon problems.