Abstract: The homogenous climate data is the foundation of meteorological research, operation and services. This paper introduces the basic concept, the scope, main reasons of the data inhomogeneityand the importance to solve the problem in China. Firstly, we introduce the development history and the current progresses in the field of climate data homogenization, and point out that the development boom of the second generation data products, which is featured by the high temporal and spatial resolutions in meteorological data, will bring good opportunities and severe challenges to climate data homogenization studies; then, we summarize the related researches on three kinds of climate data (surface, radiosondes and radiation) and present the existing gaps and deficiencies in China on the depth and breadth of research in related fields, and point out the needs to solve the key problems in science and technology. Finally, we suggest how to correctly understand and deepen climate data homogenization studies, and how to strengthen the climate data product research and development, so that we may step forward a new stage of the climate data products development and of management level in China.