China's economy is in a critical period of growth dynamics switching as the growth rate shifts to a high-quality development stage. Based on China's inter-provincial panel data from 2000 to 2022, focuseing on the issue of China's economic growth momentum switching, the spatial and temporal evolution of economic growth momentum switching and the "double threshold" effect was explored. The results show that productive labor, R&D labor, production inputs, and R&D inputs significantly contribute to China's economic growth. China's growth momentum switching has experienced the "productive labor and production inputs", and "R&D labor and production inputs", and "R&D labor and production inputs", and "R&D labor and R&D input". The spatial and temporal evolution of China's economic growth dynamics has regional heterogeneity and time heterogeneity, and there are significant differences in economic growth dynamics between different regions and time periods. the switching of China's economic growth dynamics is subject to external constraints, and there exists a "double-threshold" effect. At the same time, it uses the main experiment to add control variables before and after the comparison, bilateral shrinking tails, excluding the impact of epidemics and propensity score matching to conduct robustness tests, and finds that the empirical results are robust. This study helps to understand the mechanisms, paths and constraints of switching economic growth dynamics, and provides a reference basis for formulating corresponding policies and strategies.

Based on the panel data of 35 large and medium-sized cities in China from 2008 to 2016, Tobit model and input-oriented data envelopment analysis (DEA) method was used to explore the impact of urban housing sales price on urban total factor productivity. It is found that in the overall dimension, the urban housing price and urban productivity present an inverted U-shaped curve, which increases first and then decreases. The urban housing price level exceeds the maximum critical value of "Houses are for living in, not for speculation", and the inhibiting effect of housing price rise on urban total factor productivity is significant. The effect of housing price on the productivity of cities with different population sizes is heterogeneous. When the city population size reaches the standard of the very large-sized city, the housing price and urban productivity show an inverted U-shaped feature, and when the city population size reaches the standard of the super large-sized city, the inverted U-shaped feature of housing price and urban productivity disappears. The inverted U-shaped relationship between housing prices and urban productivity in different types of cities and the heterogeneity of cities indicate that China's large and medium-sized cities should carry out the fine adjustment of housing prices, and the policy positioning of "Houses are for living in, not for speculation" has a solid theoretical basis and practical necessity.