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, especially the sulfurfree and alkalifree accelerator, are proposed in aspects of mixing volume, price, storage stability and safety and environment protection. Finally, the research direction for liquid accelerator is recommended.