Alkali/surfactant/polymer（ASP）flooding produced liquid has high emulsification stability，which affects the stable operation and effective dehydration performance of crude oil electric dehydration process. In order to improve this problem， polyaluminium chloride（PAC）was used as a chemical regulator to control electric-field destabilization by charge neutralization mechanism. The results showed that PAC could reduce the electronegativity of the emulsified system，decrease the peak current of dehydration，shorten the duration of peak current of dehydration，improve the response performance of the electric-field，and increase dehydration rate in ASP flooding dehydration process. The dehydration rate of produced liquid increased from below 95% to above 97.5% after adding PAC. When the mass concentration of PAC was from 180 mg/L to 240 mg/L，both the response and mechanism of electric-field dehydration played a significant role during the operation，low current value with short duration and steady change of current were obtained. The water cut in crude oil and oil content in separated water was controlled within 0.30% and 100 mg/L respectively after experiencing dehydration process. Furthermore，the control effect at 60 ℃ was further improved due to the increased dehydration temperature. PAC could be used to improve the problem of electric-field instability in dehydration process for weak-base ASP flooding produced liquid. The electronegativity could be reduced，the oil-water interfacial film intensity could be weakened，and the electric-field destabilization performance could be improved by means of the potential mechanism of charge neutralization and electrostatic adsorption of PAC.