Abstract: The engineering fuzziness synthetic evaluation method is recommended in the paper to evaluate the technology of natural gas pipelines. Five aspects, including pipeline dimensions, how advance the technology is, environmental protection, safety and reliability, profit, twenty indexes of first class, and thirty one indexes of second class compose the system of index evaluation on natural gas pipeline. Evaluate the present natural gas pipelines with common used parameter, in which many famous pipelines in China and oversea are set as benchmarks and evaluation index system is adopted.