Winter of inorganic chemistry,namely the 3rd period The early 19th century the second world war,inorganic chemistry dropped behind other branches of chemistry Revival of inorganic chemistry,namely the 4th period After 1930,especially 1950, *Applications of modern physical techniques .Accumulation of various knowledge involving structures of inorganic substances,periodic law of elements,rules of inorganic reactions,thermochemistry and thermodynamic process, Large-scale inorganic industrial systems .Promoted by the atomic energy plan during the second world war After 1930, especially 1950， •Applications of modern physical techniques •Accumulation of various knowledge involving structures of inorganic substances, periodic law of elements, rules of inorganic reactions, thermochemistry and thermodynamic process， •Large-scale inorganic industrial systems •Promoted by the atomic energy plan during the second world war The early 19th century ~ the second world war，inorganic chemistry dropped behind other branches of chemistry Revival of inorganic chemistry, namely the 4th period Winter of inorganic chemistry, namely the 3rd period