To study the autobiographical digital characteristics of random process and its expansibility, the rela- tionship among process elements was analyzed by using the principle of extended analysis of primitives. By con- sidering features of process element and the correlation and implication on these features, this paper concluded that when the amount of a characteristic in the process element changed, the value of other features in the pro- cess element would bring about conduction transformation, which produced the concept of the conduction corre- lation function and the self covariance function. The case study of the carrier landing system shows that this method provides possibility for solving a class of contradictory problems involving digital characteristics of ran- dom process.