A new method for the synthesis of 1,3 bis(3 hydroxypropyl)tetramethyldisiloxane(Ⅱ) is reported from (CH 3CH 2O) 2Si(CH 3) 2, ClCH 2CH 2CH 2OH and metal Mg through Grignard reaction, the overal yield is 42.0%. A new compound 3 chloropropoxyethoxydimethylsilane(Ⅰ) was synthesized in good yield (92.9%).