This work includes 12 research papers on language test and measurement by Zhang Kai, Chen Hong, Xie Xiaoqing, etc. The whole book is further divided into five subjects as follows: the relation among language test and measurement and their basic theory, study on language ability issues, validation study, measurement and statistics technique, basic principle and method for measurement. The authors in this book are all prestigious experts in the areas of language test and Chinese test research in China.