Performance of contract is largely affected by perceived justice of the private.Firstly,the definition of perceived justice of the private is developed and it is analyzed in different dimensions through literature review.Secondly,its measuring items are obtained through adjusting the result of encoding which has been gained in the former qualitative research using investigating in advanced.Thirdly,a measurement scale of perceived justice of the private is developed with good reliability and validity using structural equation model to investigation in a sample of 89.It includes distributive justice,procedural justice and interaction justice,with total of 3 dimensions and 19 items.The result of research shows that risk actually assumed by the private consistent with agreement has more significant influence on distributive justice comparing to revenue actually gained by the private be consistent with agreement; the influence of rationality of performing duties by the public,effectiveness of the right to know by the private,effectiveness of the right to doubt by the private on procedural justice are increased in turn.Treating mutually has more important influence on interaction justice comparing to information exchange.