The invention relates to a software system state evaluation method based on parameter correlation. The method comprises the following steps: (1) determining state parameters of a software system; (2) determining types of the state parameters, wherein the state parameters, of which the performance is improved along with the increase of state parameter values, of the software system are positive correlation parameters, and the state parameters, of which the performance is lowered along with the increase of the state parameter values, of the software system are negative correlation parameters; (3) acquiring values of all the state parameters in the current software system, so as to obtain the measured value of each state parameter; (4) scoring each state parameter according to the types, normal values and measured values of the state parameters; (5) calculating the sum of scores of all the state parameters, and judging the system state of the current software system. The method has the advantages that the software system state evaluation method is provided, the system state is determined by using normal values of sample data and correlation scores of system performance, the accuracy of system state evaluation can be improved, and the error of system state evaluation can be lowered.