The construction and working principle of the new technique pumping observation system of submersible pump frequency conversation steady flow is introduced.Combing with the actual application condition of the new system on Tangcan-1 Well,we found that the introduction of the new technique not only retrieved the observation of each item,but also eliminated dynamic interference of the adjacent hot water mining well on each item,and obviously improved the response ability of well water level to crustal stress and strain to realize subsurface fluid comprehensive observation of physical and chemical multi-items.The new technique applies to seismic observation wells of zero flow and facing zero flow,and transformation of hydrostatic level observation well to underground fluid physical and chemical comprehensive observation well in the observational condition of artificial steady flow water dumping,in order to improve the seismic monitoring ability of underground fluid observation network.