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[Abstract] The present study has been focused on measuring the combustion process of gelled propellant in high-pressure oxidant environment. The research object consisted of gel droplet and gel spray due to different extruding speed for the gel injector. Results show that the burning behavior of gel droplet in high-pressure oxidant environment is very different from the burning behavior of gel droplet in room pressure conditions. The burning flame structures of gel droplets in high-pressure conditions evolved very violently. The microexplosion phenomenon was more vigorous usually resulting that the maternal droplets broken into several smaller droplets which dropped off during their burning processes. And while the smaller droplets were dropping off, the long-plume from burning flames were protracted behind them. In a moment when the smaller droplets burned out, their burning flames become more luminous instantaneously. And it is interesting that the dropping route of the smaller droplet was not downward vertically rather than floated due to the synthetic effects of gravity, buoyancy, and microexplosion force, and so on. Additionally, the combustion process of gel spray was accelerated as the pressure in chamber was increased.