将概率因果模型的似然函数作为遗传算法的适应函数,从而将复杂系统的故障诊断转化为最优问题,建立了一种将概率因果模型和遗传算法相结合的故障诊断方法,并利用改进算法与概率因果故障诊断模型对船用核动力装置进行故障诊断实例分析,分析结果对船用核动力装置故障诊断具有重要的指导意义,而改进遗传算法是进行船用核动力装置故障诊断有效而实用的方法。 Taking the probability function of probability causality model as the fitness function of genetic algorithm, the fault diagnosis of complex system is transformed into the optimal problem. A fault diagnosis method combining probability causality model and genetic algorithm is established. By using improved algorithm And the probabilistic causal fault diagnosis model to the ship nuclear power plant fault diagnosis case analysis, the analysis results of marine nuclear power plant fault diagnosis has an important guiding significance, and the improved genetic algorithm is an effective and practical method for marine nuclear power plant fault diagnosis.