The invention discloses an auxiliary decision-making method for the equipment state maintenance of information systems. The auxiliary decision-making method comprises the following steps: S1, establishing an auxiliary decision-making platform for the equipment state maintenance of an information system, and acquiring state parameters and operating parameters, which are relevant to state maintenance; S2, establishing a two-dimensional relational model of system evaluation indexes, and setting a maintenance timing sequence and maintenance grades; S3, establishing a two-dimensional relational model of time and failure omens, and setting a forewarning threshold and an alarm threshold in the model; S4, obtaining a historical change curve, comparing the historical change curve with the current parameters of the information system so as to judge the state of the current information system, and bringing the judged result into the step S2 so as to obtain a maintenance conclusion. The auxiliary decision-making method disclosed by the invention is used for diagnosing the states of the systems. According to the invention, the system state maintenance aid is realized through rules, models, algorithms and reasoning. The implementation of the method is help to improve the system maintenance level, improve the system availability, reduce the production cost, and improve the economic profits of enterprises.