Abstract：Among all the documents about social contradiction or social conflict in present China,there exist a group of concepts with "family resemblance",such as "collective resistance","right defending","mass event","social conflict","collective action" and ect.Each of these concepts has its affiliation.While expounding the concepts in their researching,scholars always insist in the peculiar character of their connotation or research methods.It's considered in this text that the concepts mentioned above have some obvious inadequacies which are unfavorable for the academic talks and exchanges between scholars.After sorting and evaluating these concepts,a new concept "collective action" is put forward based on the expression of interests.The concept is also considered to be a commanding,standarded and scholastic concept about the study on social contradiction or conflict in the context of present China.
