Free electron laser (FEL), called the fourth advanced light source, is the most advanced experimental device to explore the microscopic world. It has a transformative driving effect on many subjects, such as energy, physics, chemistry, materials, biology, etc. With the successful research of "comprehensive experimental research equipment based on tunable EUV coherent light source (Dalian Coherent Light Source, DCLS)", China's vacancy in this area has been filled. DCLS could be expected to be the edge tool to promote the development of science and technology in China. This paper briefly reviews the research background of DCLS and the development status of FEL at home and abroad, then states the significance of the successful research of this equipment, and finally highlights its application prospect.

A lot of epoch-making discoveries have been revealed by the century long study of cosmic rays. However, issues related to the origin, acceleration and propagation of cosmic rays remain to be mysterious. The large high altitude air shower observatory (LHAASO) is a unique experiment having both advantages of high altitude and large effective area. Besides, LHAASO will greatly improve the discrimination power between gamma ray and cosmic rays by using the hybrid detector technology. LHAASO is expected to obtain unprecedented gamma ray detection sensitivity and to make very precise measurement in cosmic ray spectrum in a very wide energy range. LHAASO will make important contribution to understanding fundamental problem of cosmic ray, to the research in high-energy astrophysics, cosmology and the exploration of new physics. This paper briefly describes the concept and structure of LHAASO detectors, the advanced performance, and scientific goal of LHAASO.

This paper introduces the special space location and typical meteorological characteristics of the near space, combs the situation of scientific exploration and research on the near space through space-based, ground-based and in-situ platforms at home and abroad. To aim at the current situation of insufficient understanding of the near space, the paper argues that the scientific exploration and application of the near space should take the near space vehicle as the main platform, whose technological development and application status are reviewed including high-altitude balloons, stratospheric airships and solar long-range UAVs in military and civil markets. Finally the condenses some key issues that need attention and puts forward some concrete suggestions for the near space development and application of our country.

Space science encompasses all major frontier basic researches that base on spacecraft platforms to obtain experimental data and realize scientific discoveries. China has started to develop scientific satellites such as DAMPE, HXMT. The international scientific community has recognized CubeSats to have important effect on deep space exploration. The occident and institutions support CubeSat's scientific research, and have implemented some missions. Significant progress of CubeSat platform has also been made in China's commercial space and space technology demonstrations, which has laid an important foundation for scientists to make breakthroughs in space science.

The paper introduces the American space science strategic planning, the layout of its science programs and its development mechanism at first. Then it concludes with several suggestions advices for China to accelerate its space science. Despite the huge difference between China and US, we propose that, with the growing importance attached to Chinese space science, it is necessary to think highly of strategic planning and its authority, to insist on the national cause of space science programs, with worldwide openness at the same time, and to foster space science missions in more extensive involvements.