Abstract: A cost-effective evagination-lining method to repair underground pipeline is introduced in the article. This method can be used to rehabilitate the deteriorated underground gas, water, sewage and other likehood pipelines. This method has following advantages, that is, unnecessary to dig up a pipeline over its full length on the road surface, suitable for more complex situation, and efficiency better than others. This method is consisted of two techniques, gas-pressure way and liquid-pressure way. The paper indicates that the method that utilizes a gas pressure is excellent than a liquid pressure in some respects of the lining's quality, construction cost, and environment protection.