Nine new compounds of 2-di-alkylaminoethoxy-4-substituted-acetophenones, two new compounds of ortho-or para-diethylaminoethoxy-desoxybenzoins and two new compounds of 2-methoxy-4-substituted-β-dimethylaminopropiophenones have been prepared for the purpose of carrying out screening test of experimental animals infected with Schrstosomiasis Japonica.