“…Cui & Mak (2002) use the R&D intensity (annual R & D expenditure/annual sales) as the measure to conduct the research, and found that the drugs and biotechnology products, computer and office equipment, communications equipment, electronics, measurement and lab analysis instruments, medical apparatus, programming and software and so on, belong to the hightech industries [30]. And compared to the China Securities Regulatory Commission which was issued in 2011, "listed companies' industry classification guidelines", and the paper choose the manufacturing and information technology industry companies as the research sample, and use the R&D investment intensity to measure the firm innovation, and then study the relationship between the house price and the firm innovation of the 35 large and medium cities in China.…”