Rotary excavation is an advanced pile construction method which has developed rapidly in China in recent years.Rotary drilling machine construction has the characteristics of high efficiency, low noise, environmental protection, high quality of hole formation and high degree of mechanization.Both foreign products and domestic equipment structure and working principle are the same, but the construction strata is very different.The specific technical requirements of construction are different. Only by selecting different drill bits to meet the above requirements, scientific selection of drill bits and reasonable use of drill bits, can the construction technology of rotary drilling RIGS be enriched to a certain extent and the construction field of rotary drilling RIGS be broadened.