In order to solve the problems that sand consolidation strength was low and sanding was easy during positional fracturing inside the thick oil reservoir in ultra-high water cut stage of Daqing oilfield，a modified phenolic resin was synthesized. After the modified phenolic resin and hexamethylenetetramine curing agent were evenly mixed and reacted ，a new sand consolidation agent was obtained. By using compression strength testing method of consolidated sand sample，the effect factors on sand consolidation performance of sand consolidation agent were analyzed ，and the formula of sand consolidation agent was optimized. The results showed that the infrared spectrum of modified phenolic resin was haracterized by the adsorption peak of —CH₃，—CH₂—，benzene （PhH ），1 ，2 ，3-three replacing —CN—of PhH and Ar—O—R ，and the stretching vibration absorption of C—N，—N—H—，C—O of tertiary alcohol. The theoretical structure of the product was consistent with the actual structure. The mass ratio of fracturing sand ，linear phenolic epoxy resin，curing agent and coupling agent（γ-aminopropyl triethoxy silane）in sand consolidation agent was 100∶6∶0.6∶0.1. The curing time was 48hrs. The compressive strength of solidified body under this condition was 8.8 MPa，showing good sand consolidation performance.