Abstract: Glycidyl methacrylate (GMA) was grafted on micronsized silica gel particles through “graft from” strategy in a solution polymerization system with the mediation of the coupling agent γmethacryloxypropyl trimethoxysilane (MPS), resulting in the grafted particles PGMASiO2. Subsequently, ringopening reaction of the epoxy groups of the grafted PGMA was carried out with iminodiacetic acid (IDAA) to introduce IDAA groups on to the composite particles to obtain IDAAPGMASiO2. The effects of the main factors on the graft polymerization of GMA were examined and the adsorption behavior of IDAAPGMASiO2 particles towards rare earth ion Eu3+ was explored. Results show that during graft polymerization, the grafted polymer layer is a hindrance to the subsequent graft polymerization, the reaction temperature and the amount of initiator show great effect on the graft polymerization. Under the optimized conditions, the grafting degree of PGMA on the surfaces of the grafted particles can reach 17.48 g/100 g. Relying on the strong coordination chelating action, the particles IDAAPGMASiO2 exhibit strong adsorption ability towards Eu3+.