Abstract: It is very important to ascertain the influence degrees of life cycle cost(LCC) for LCC estimation and management.This paper dynamically analyzes twelve factors that affect the LCC of one type of marine diesel engine by using system dynamic theory and method.The influence degrees of these factors are determined by simulation calculation and analysis.The results can provide some guideline for filtration of LCC influence factors,basis for LCC calculation modeling of the main factors,and decision information for LCC management and control.