[en] This issue is the collection of papers presented at The 8th Japan-China Bilateral Symposium on Radiation Chemistry held on October 25-29, 1999 at Kyodai Kaikan in Kyoto. The total number of the contributed papers is 69 which consists of 41 and 28 papers for oral and poster presentations, respectively. The papers presented are classified into five categories: A: Radiation Chemistry - Fundament (21 papers), B: Radiation Chemistry - Polymer (10 papers), C: Radiation Chemistry - Biological System (8 papers), D: Radiation Processing (19 papers), and E: Advanced Radiation Chemistry - Ion Beams and Positron (11 papers). The output of the Symposium and the history of the Bilateral Symposium were compiled in the Closing. (J.P.N.)