Abstract: To correctly evaluate coal cities' sustainable development condition in the process of industrialization, avoiding the situation of "mine exhaust city decline" in such cities, considering many uncertain factors of evaluation of coal cities' sustainable development, as well as numerous evaluation indexes which are difficult to dig latent rules, this paper organically combines cloud model, rough set with entropy theory and establishes evaluation model, making reasonable evaluation of the sustainable development condition of ourcountry's 25 major coal cities. Firslly, constructs the index system on the basis of considering various influencing factors of coal cities' sustainable development and uses cloud transform to make discretization of the initial data, then simplifies the index system through reduction of attributes; secondly, uses the entropy weight to determine the index weight according to the simplified index system, finally determines the sustainable development level of every coal city by X-condition cloud generator, providing certain basis to further improving coal cities' sustainable development level.