It has been shown that increasing the temperature of hydrolysis or using a mixed solvent composed of acetone and toluene favours the hydrolytic co-condensation of me-thyltrichlorosilane with phenyltrichlorosilane and dimethyldichloroaihme，but avoids the gel-forming phenomenon．As a result of which a solventless

hydroxyl condensativn type silicone resins with lower R/Si，C6H5/R ratio and higher Si-OH group content can be prepared，and the resins are suitable for transfer moulding compounds．By umng these methods the probedure is simplified，the time of operation is greatly shortened and the quality of the resins is stable．In addition．the relation between the structures of the resins and the properties of the transfer moulding plastics has been discussed．A proper choice of curing agent and a general purpose reinfereed filler will result in excellent performance of the plasties．