The Board of Directors of Sinopec Oilfield Service Corporation announced that, due to change of working arrangement, Mr. Jiao Fangzheng has tendered his resignation to the Board as Chairman of the Board, the non- executive Director and Chairman of Strategy Committee of the Board, with effect from 7 June 2018. Mr. Sun Qingde, Vice Chairman of the Board, will perform the duties of Chairman of the Board with immediate effect until a new Chairman of the Board is elected.