This paper has studied propagation criterion of boolean functions and boolean permutation and has gained results as following : 1 ) in the first chapter , the main study achievements and results of boolean functions satisfying propagation criterion have been summarized . 2 ) in the first section of the second chapter , the propagation properties of boolean functions have been studied 本文对布尔函数的扩散性和布尔置换进行了研究，取得了下列成果： 1 )综述了国内外关于满足扩散准则布尔函数的主要研究成果，即第一章； 2 )对满足k次扩散准则的布尔函数进行了研究，即第二章第一节。
The access to justice is to realize the social common justice by reforming the present tedious procedure of lawsuits , creating new ways of lawsuits , enlarge the use of replaceable disputes , trying to realize and enlarging the law security of the poor , consumers and the weak , and providing the profitable relief ways for the extended and collective interests 它成为国际社会民事诉讼改革的指导方针。所谓“接近正义”是指，通过改革现行繁琐的诉讼程序，创制新的诉讼方式，扩大替代型纠纷的适用，努力实现并扩大贫困者、消费者和弱势群体的法律保护，为扩散性利益、集合利益提供可行的救济途径，最终实现社会的普遍正义。
