The third part and forth part are the main body of this paper . the third part includes the legal attribute and characters of demand guarantee , which points out the double legal attributes and later focuses on the primary character of independence , absolution , promissory estoppel and trend of documentation 第三部分是见索即付保函性质和法律特征，首先分析关于其法律性质的几种学说，其次重点研究其独立性本质特征，最后，对比传统的从属性保函，探讨了其表现出的无条件性，允诺禁反言，单据化和表面一致的法律特征。
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The restraints towards the parties for its action behavior , including : a ) the parties cannot use improper conducts to file a lawsuit with actual malice , b ) they cannot abuse their rights of action and misrepresent before courts to influence its judgment , c ) they will not lose their rights of action , and d ) estoppel ; 2 诚实信用原则的适用具体体现在： 1对当事人诉讼行为的约束，包括：禁止不正当行为恶意制造诉讼状态，禁止滥用诉讼权利，禁止虚假陈述影响法院正确判决，禁反言，诉讼上权能丧失。
With the help of charts , it analyses such problem as circumstance in which prosecution history estoppel is applied , and the basis thereof , expounds how to distinguish the relationship from the patented technology , the prior art and the accused infringing technology in the course of applying the argument of prior art 借助于图表，分析了适用禁止反悔原则的各种情况以及禁止反悔的根据问题，探讨了在适用已有技术抗辩时，如何区分专利技术、已有技术和被控侵权技术三者之间的关系。
