Reversible invert emulsion can combines the advantages of different liquid forms in one to play a better role that is expected, it is mainly used to prerare reversible invert emulsion drilling fluid. Thought about the hydrochloric acid used in the oilfield is mainly industrial hydrochloric acid(concentration is 15%~20%),which is different from the diluted hydrochloric acid(concentration is near 5%) used in laboratory, and the concentration of different batches industrial hydrochloric acid is also different, this paper take a study on the effect of the concentration of acid and alkali on the performance of the pH⁃responsive reversible invert emulsion.Studies have been conducted on the effects of acid and base concentration on the pH⁃controlled reversible emulsion,by measuring microstructure and bulk properties of the emulsion.The studies demonstrated that, different acid/base concentrations result in different acid/base densities can affecting the phase transition point of the reversible emulsion, the difference in acid/base concentration causes the volume of the aqueous phase accompanying the addition of acid/base to the emulsion system, which also affects the phase transition point of the reversible emulsion, but the former has a greater impact than the latter.