Application system for predicting faults of complex system

The invention relates to an application system for predicting faults of a complex system. The complex system comprises multiple service subsystems; the application system comprises following modules: a log collection module for collecting the log file of each service subsystem in real time and respectively adding time labels and/or host labels in the log files; a log capturing module for capturing the log file of each service subsystem in at least one time window; an analyzing and comparing module for calculating the fault indexes of the complex system in the time window based on the log file of each service subsystem; and a reporting module for predicting the faults of the complex system and/or reporting the fault indexes of the complex system. According to the system of the invention, a user can obtain warning information before the complex system generates faults; therefore precautionary measures to a certain degree can be taken; the loss is reduced; and the application system is simple in realization mode and low in realization cost.