Abstract:In this paper，the fish （Pneumatophorus japonicus）was studied，and the effect of low-voltage frequency conversion electric field intensity on the preservation of P.japonicas was discussed.The electric field equipment（3 000 V/m 50 Hz and 2 000 V/m 50 Hz）was used.The water content，pH value，total volatile basic nitrogen and total bacterial count during storage were measured，and the microstructure was explored by electron microscope scanning.The paper provides a theoretical basis for the safety，quality control and technology research and development of fish partial freezing storage.The results showed that with the extension of storage time，the total volatile basic nitrogen in 2 000 V/m，3 000 V/m and no electric field groups gradually increased，while the value in2000V/m and3000V/m electric field groups was significantly lower than that in no electric field group（p＜0.05），and the rising was slow.And greater field intensity led to more obvious inhibition effect.On the 20th day of storage，the total bacterial count in 2 000 V/m and 3 000 V/m electric field groups was significantly lower than that in no electric field group（p＜0.05），while with the increase of field intensity，the inhibition effect was less obvious.On the 20th day，the pH value in electric field groups was lower than that in no electric field group.The electron microscope scanning showed that the muscle tissue gap of P.japonicus became larger during storage，and that of P.japonicus in electric field groups was smaller，which indicated that electric field had better protection effect on muscle tissue of P.japonicus.With the extension of storage time，the water content of P.japonicus decreased，and 2 000 V/m and 3 000 V/m electric field groups had less water content than no electric field group，which revealed that electric field would accelerate the water loss of P.japonicus during storage.This study could further optimize the preservation process of electric field，and provide reference for the application of low-voltage frequency conversion electric field.