Bismuthsubgallate is a compound of indefinite composition containing bismuth and gallic acid. Because its structure was indefinite, many papers have been reported for it. But these are different one another and the relationship between the physical properties, structure and manufacturing condition has not been yet reported. In this experiment, bismuthsubgallate was prepared from bismuthnitrate and gallic acid in an acetic medium at 65°, and dried at four different temperatures 30° 65° 105° and 155°. And some of the other relative bismuth organic compounds were prepared. To each product, elemental analysis, IR spectra and DTA, TGA curves were determined. These results revealed the followings; 1. The structure of bismuthsubgallate is comfirmed as a complex form of gallomonohydroxo-bismutic acid monohydrate and its yellow colour dependent upon complex anion in the structure. 2. According to the drying temperature, the hydrate content of the bismuthsubgallate is quite different: dihydrate at room temperature, monohydrate at 65°, anhydrous at 105° and decomposed partially oganic substance of the structure above 155°.