Abstract: Fluorescent material with characteristic wave-length of 450 nm is used as tracer to look for the flee-flowing channel between production wells and injection wells. The quantity of tracers can be calculated by static adsorption experiments and the estimation of the groundwater volume in test area. The 267 m³ so-lution with the fluorescence tracer concentration of 15 mg/L was injected to 15N9 well, and the time of in-jection was 40 hours. The water sample from the corresponding 14 production wells was checked. The re-sult showed that high permeable zone or flee-flowing channel existed in 4 production wells. The initial in-jection pressure of 15N9 well is 6.0 MPa, and after profile con-trol it can reach to 12.5 MPa. The extra oil production of the corresponding production wells can be 3.5 t for a single well everyday, and the water content ratio decreased by 9.55%.