Abstract: The changes of coal mines hazard source state will probably lead to risk, identifying and analyzing the state changes of hazard source plays important place to control the state changes and cut the causal chain of the coal mine accidents in coal mine safety management. From the aspect of system, this article models the hazard source system of risk precontrol management of coal mines by analyzing hazard source tense system and state. Taking the hazard source system obeying Phase Type distribution as an example, this article employs the system reliability theory to analyze its reliability indices including the instantaneous state probabilities, the reliability, availability, abnormal failure probability, first failure to abnormal and emergency failure. Some numerical examples are introduced to verify the procedures.