The state-of-the-art of development of liquid accelerators in China and other countries is summarized. The liquid accelerator is classified into 4 types,namely,water glass,sodium and potassium aluminates,aluminum sulfate,sulfur-free and alkali-free,on basis of main accelerating components. The R & D and new achievements of liquid accelerators in China and other countries are introduced in terms of manufacturing, properties and accelerating mechanism. And then the problems of existing liquid accelerators,esp...