The invention discloses a communication network alarm analysis method and system based on fault source alarm intensity, is used for quantitatively measuring the alarm intensity of a fault source withan alarm, and relates to the field of communication network operation and maintenance. The method comprises the following steps: collecting and counting the total network alarm amount and the alarm amount of each fault source in an investigation period; calculating the alarm speed and ratio of each fault source in the investigation period; and calculating the alarm intensity of each fault source.According to the invention, the quantitative calculation and evaluation of the alarm intensity of the alarm in the distribution state of different fault sources in the communication network can be realized, and the operation and maintenance production work is guided.