The gelation of the in-situ polymerization gel is rapid and the concentration of active free radical in the polymerization system is hard to be controlled，which are caused by thermal decomposition initiator. In view of this problem，simultaneous reverse and normal initiation ATRP（SR&NI ATRP）is applied to control the gelation time. The ferric trichloride，ligand and sodium chloroacetate are added into the in-situ polymerization gel to convert the mechanism of free radical polymerization into SR&NI ATRP initiation mechanism to control the concentration of free radicals and prolong the gelation time.Experiment results show that the gelation time of the in-situ polymerization gel using thermal decomposition radical initiator is less than ten hours at 50-80 ℃. Compared with EDTA and 1，10-phenanthroline，2，2’-bipyridines is more suitable for the ligand of SR&NI ATRP. The gelation time can be longer than 25 h when its mass fraction is between 0.05% and 0.09% at 60 ℃. In addition，the gelation time of in-situ polymerization gel could be controlled to be greater than 20-40 h by adjusting the mass fraction of ferric trichloride，2，2’-bipyridine and sodium chloroacetate，which could meet the requirements of deep profile control of the in-situ polymerization gel.