To solve the problem of proppant backflow during frac-pack completion，the coated proppant with fast-curing feature at low temperature was prepared by surface grafting modification and characterized by means of scanning electron microscopy，energy spectrum analysis and infrared spectroscopy. The compatibility of proppant and sand-carrying fluid as well as the flow back control performance was studied by contrast test. The interaction between the molecules of the proppant coatings was investigated by first-principles calculation. The results showed that the coated proppant presented favourable compatibility with the sand-carrying fluid with the sand proportion of 5%—30%. The dimerization of the poly（vinyl pyridine）molecules was energetically favorable and spontaneous. The results of intermolecular interaction calculation showed that the coated proppant could enhance the stability of the proppant pack through the π-π interaction between polyethylene pyridine chain segments. Conductivity tests showed that the coated proppant possessed excellent fast-curing performance at low temperature. After being cured at the temperature of 50 ℃ for 2 hours， the conductivity of the proppant pack could be increased by 19.7%—53.1% and the critical backflow velocity of proppant could be increased by 1.6—3.0 times. It is of great significance to maintain the stability of the proppant pack under the conditions of low well temperature and rapid backflow at the end stage of fracturing sand control constructions.