Trenchless horizontal directional drilling (hereinafter referred to as trenchless) first appeared in the 1970s, began to be introduced into China in the late 1980s, and developed rapidly in China at the beginning of the 21st century, widely used in the construction of electricity, telecommunications, water supply, gas, sewage, etc., for the road, railway, river, hillside and other pipelines. The reason why trenchless can develop so quickly into a new industry, it has its own advantages: safety, speed, quality and so on. As a new industry, if we want to go further and longer, we must standardize, so sorting out and writing specifications is the focus of our work in the future.