The proceedings (Vol.2) include No.1, No.2, No.3, No.4, respectively. The monograph (the Proceedings of the China Association for Science and Technology, Vol.2, No.1) is the Proceedings of the Annual Conference of the China Association for Science and Technology, August 20-23, 2005. Collected in this issue are 134 papers. These papers cover the following aspects: Mathematics, Physics and Materials, Geoscience, Information Science and System Science, Engineering and Technology, Agriculture Science, Biology and Medical Science, Environmental Science and Technology, Safety Science and Technology, and Management Science. Many novel research results on these fields achieved during the last few years are mentioned in these Proceedings. Collected in the Proceedings of the China Association for Science and Technology, Vol.2, No.2, are 138 papers. These papers cover the following aspects: Basic Science, Geoscience, Biology, Medical Science, Environmental Science and Safety Science, and Management Science. Many novel research results on these fields achieved during the last few years are mentioned in the Proceedings. Collected in the Proceedings of the China Association for Science and Technology, Vol.2, No. 3, are 157 papers. These papers cover the following three aspects: Agricultural Science and Technology, Industrial Technology, and Aeronautics and Astronautics. Many novel research results on these fields achieved during the last few years are mentioned in the Proceedings. Collected in the Proceedings of the China Association for Science and Technology, Vol.2, No.4, are 167 papers. These papers cover the following aspects: Basic Science, Geoscience and Astronomy, Biology, Medical Science, Agricultural Science and Technology, Industrial Technology, Environmental Science and Safety Science, and Management Science. Many novel research results on these fields achieved during the last few years are mentioned in the Proceedings.