Based on the rough model under the similarity relation, some basic properties are studied, and a knowledge acquisition algorithm based on the similarity relation in decision systems is discussed.

Exploitation system in the medium - and upper-reaches of Shitou River valley includes basic information, database, stepped exploitation, model design, subsidiary decision and system management.

According to the model, a corresponding software has been programmed which provides a decision-making basic for optimizing transmission of long distance heated crude oil pipeline.