It is proved that when the 1N water solution of ferric sulphate is eiectrolysed under those conditions as follows, the magnetic anisotropic iron miero-powder is obtained ; PH2～3, current density 1A/dm^2, voltage7～18V and temp. of the soiution 2℃～30℃. he ratio of the length and breadth of one micro crystallie of iron is seemed to become larger as the temperature of the solution elevates as uq to 30℃，but under the higher temperature than 30℃, the ratio becomes small. When the ethanole added solution is electrolysised，the obtained micro−crystalline is a well-defined rectangular form, and this fact is to be more minutely studied The large quantitis of glycerine added to the solution let the size of the micro crystalline larger, and so the ratio of the length and breadth.