Length measurement, one of the key generic and basic technologies of geometric measurement, has important applications in scientific research, high-end equipment manufacturing and space exploration. The dual optical comb absolute distance measurement technology makes the best of the characteristics of the optical frequency comb in time domain ultra-short pulse and frequency domain high-resolution. Further it achieves absolute distance measurement with high measurement rate. Until now, the problems of limited measurement range and low measurement accuracy ail the community of double optical comb ranging. To relieve it, this work presents a novel technological solution, which combines the double optical comb ranging and phase ranging. The double optical comb ranging technology is adopted to realize the high-precision measurement of the length within the non-fuzzy range. The phase ranging technology is used to measure and indicate the integer multiple of the non-fuzzy range, which is an effective complement to the high-precision measurement of double optical comb ranging. An experimental system is built to verify the feasibility of the proposed technological solution, and the results show that the measurement error is less than ±5 μm within the measurement range of 0~70 m.