A HO center dot detection method based on UV-visible spectrophotometry was established to study the generation and influence mechanism of HO center dot during electrical advanced oxidation processes (EAOPs), and to analyze the HO center dot degradation mechanism of pyridine. The ability of HO center dot capturing agents, salicylic acid (SA) and terephthalic acid (TA) were compared. Compared with SA, TA has a larger cumulative capture of HO center dot and a higher capture efficiency. The effects of electrochemical conditions were investigated by using TA as a scavenger. The results show that the foam nickel electrode has higher energy efficiency. With the increase of electrolyte concentration, the rate of electron migration in solution is accelerated, which greatly improves the yield of HO center dot. At the same time, alkaline conditions are more conducive to the formation of HO center dot. The increase of current density can accelerate the generation of HO center dot. The degradation mechanism of pyridine in the electrochemical system under different pH conditions was studied. The GC-MS analysis showed that the degradation products of pyridine were different in electrochemical treatment. The main reason was that pH affected the ring opening mode of HO center dot to pyridine. [GRAPHICS] .