Warning tape are widely used in various direct buried gas pipelines, oil pipelines, urban water supply and drainage, etc., and the fifth type of transportation system and information on national economy and people's livelihood, such as gas, liquid pipeline delivery systems, power cables, communication optical cables, etc. The warning protection of the information transmission system, especially for various urban pipe network construction sites, road construction sites, and traffic accident sites, the construction facility work site and the direct buried pipeline in the field are obvious. The function of protection and warning, it is convenient for construction, and the construction is carried out at the same time as the buried pipe, buried in the middle of the underground and the pipeline, and laid at 30-50 cm above the pipeline, which plays the role of warning signs, so as to avoid the future excavation. The working-hour pipeline is damaged by unnecessary damage, causing major accidents, and avoiding huge property and economic losses caused by accidental damage. It is an economical, effective and simple and easy-to-use product for the safety protection of various direct buried pipelines and cables. There are two kinds of warnings: one is the ordinary warning tape; The other is a metal detectable warning tape, also known as a tracking belt, (with stainless steel metal warning tape) Due to the continuous development of social economy, the construction of the underground pipe network More and more plastic pipes such as PE, PPR, and PVC are used, and the detection instrument cannot detect the direction of the pipeline at all. The line cannot detect this problem, and the product uses high-strength, aging-resistant polymer materials, with PE and woven fabrics as the main raw materials, and has been added by anti-corrosion treatment. It has good corrosion resistance, bright color and eye-catching, and has been laid underground for 50 years without corrosion or fading, which meets the requirements of long-term buried quality.