According to an aspect of the present invention, a system for generating a GIS-based optimal police line in the event of a chemical terrorism includes a memory for storing a program for generating a GIS-based optimal police line in the event of a chemical terrorism; and a processor executing a program stored in the memory, the program configured to: leak chemical through a chemical diffusion model based on GIS information including road and building information collected over the network and a leak point input by a user Create a concentration distribution region modeling the diffusion state of Among a plurality of straight roads intersecting an extended straight line, the intersection point closest to two points is selected as the starting point and the ending point, and the first shortest distance connecting the starting point and the ending point is searched on the map and provided as a police line.
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