Abstract: The paper firstly reviews the development and research progress of the basic issues，such as definition and principles of green chemistry and chemical technology as well as quantitative description of greenness and “non-green problems” in the research of green chemistry and chemical technology，and secondly explores and studies the questions， such as how to complement the present basic principles，i.e.，the twelve principles，whether green chemistry should be separated into an independent discipline or not，and how to describe and evaluate effectively the greenness of green products (green chemistry) and green processes (green chemical technology). The twelve principles are considered still the guiding principles to study green chemistry，but two new principles could be added，that is，design and manufacture of materials which could be reclaimed and used time after time，such as catalysts，chiral reagents etc.，as well as improvement of former processes and techniques by using process intensification and integration etc. Green chemistry and chemical technology should be an independent discipline to be studied more deeply. The greenness of products and processes could be quantitative described，but different parameters and methods must be chosen depending on different objectives. In the same time， more attention should be paid to studying and solving the “non-green problems”，such as research on ionic liquids etc.