According to the cases of deterioration of big concrete structures investigated in Canada, it was repeatedly emphasized to pay attention to durability. In the respect of cement classification it was suggested to cancel “ordinary silicate cement”.The cement industry should be gradually changed to “green industry of cementitious materials”. The standards and compositions of cement should be reviewed on the basis of technical advances of concrete. Finally it was suggested to bring the production, circulation and utilization of cement into line in order to obtain great economic and social benefits.