Porous NiTi alloy was prepared by the gel injection method using titanium powder and atomized nickel powder as the original powder and hydroxyethyl methacrylate (HEMA)-1,6-hexanediol diacrylate (HDDA) as the gel system. The effects of initiator, catalyst, curing temperature and solid volume fraction on the curing process were investigated. The results showed that the curing time decreased with the increase of initiator and catalyst addition, and the best amount of catalyst N,N-dimethylaniline (DMA) was 1.5 wt.%, and the amount of initiator tert-butyl peroxybenzoate (TBPB) was 2 wt.%; The curing reaction was accelerated with the increase of curing temperature and solid phase volume fraction; Based on the DSC test results, the apparent activation energy of the curing reaction of the HEMA-HDDA-TBPB-DMA gel system was obtained as 61.52 kJ/mol, and the reaction order was 0.91. Porous NiTi alloy with porosity of 32.68%, compressive strength of 331 MPa and three-dimensional connected two-stage pore structure was prepared using 50 vol.% Ni Ti slurry under the optimal curing process conditions.