20 世纪90年代末，随着社会综合实力的提升和专业领域交流需求的增加，全国性的园林园艺博览会开始出现。1999年昆明世界园艺博览会的举办，将我国园林园艺博览会的发展推到了世界级的高度。我们至今仍能回忆起昆明世园会满园的春色、精美的园林、熙攘的人潮和悠扬的民族舞曲，每一位参观者都是兴奋的、期待的、积极的，这种场景在后来的上海世博会中也表现得较为突出。时隔20年，国际A1 类的世园会又一次来到中国，北京会给世界呈现什么样的状态呢？我们同样期待。

世界是变化的，20年来，中国大中小城市的面貌都发生了实质性的改变，园林行业也发生了深刻的变化，由简单的园林绿化美化走向了生态文明引领。人们对园林园艺已经不再陌生，不同层级的世园会、园博会、绿博会、花博会层出不穷，轮番上演。人们对世园会的理解逐渐由关注表象到关心实质，世园会要解决的问题越来越综合、越来越复杂，这些都给主办方和设计师带来了前所未有的挑战。

从历史发展看，世园会要承载一个国家在特定历史时期的发展理念和发展水平，要向世界展示园林园艺发展的新理念、新技术、新成果，这是要有高度的。北京世园会举办之际，正值新中国成立70 周年，全面建成小康社会前夕。世园会组委会提出要将2019 北京世园会作为展示我国生态文明建设成果、促进绿色产业国际交流与合作的重要舞台，作为弘扬绿色发展理念、推动经济发展方式和居民生活方式转变的重要契机，作为建设美丽中国的生动实践。从这个意义上看，我们就不难理解本届世园会的办会目标“世界园艺新境界，生态文明新典范”。

从社会生活看，世园会要承载当下社会发展和人们生活的需要，这是要有广度的。如今的世园会不仅仅是一场有期限的展览活动，更要持续有效地带动区域经济的发展，并为更大范围的人们创造美好的生活环境。于是“绿色生活，美丽家园” 成为本届世园会的主题。世园会需要更关注本质，关注园林园艺走进生活、服务市民，需要更关注园林园艺从业者之间的展示交流、促进行业进步，而不是把重点放在展会期间短暂的狂欢和庆典。世园会后的世博园要成为北京的新地标，一个绿色生态的大花园，以此带动地区的绿色产业升级和旅游经济发展，为北京和全国服务。

从规划设计看，世园会要体现出风景园林规划设计的最新理念和最高水平，这是要有深度的。20年来，我国风景园林事业蓬勃发展，有影响的设计机构越来越多，百花齐放、百家争鸣，国内外设计师经常同台竞技，设计理念不断融合。设计师在注重功能和形式的基础上，不断思考人与自然、主观与客观的关系，不断践行传统园林文化精髓思想的传承与创新，不断探索生态理念在地域性景观营造上的实施策略，这些都可以在本届世园会的规划设计中有所体现。“让园艺融入自然，让自然感动心灵” 的办会理念，将打开设计师与自然相通的内心世界，并通过设计传达给公众，感染每一位游客。

2019年来了，北京世园会来了，我们可以设想这样的场景，围绕中国馆的核心景区将成为游览的热点，山水园艺轴和世界园艺轴将精彩纷呈，各个公共景点和众多国内外展园将带给我们更多的惊喜。作为专业人士，我们需要透过表象去思考，我们能否通过本届世园会，捕捉到世界园艺发展的趋势，找到行业甚至个人的未来方向。本期的主题文章可以带给我们对北京世园会初步的了解，更重要的是，我们要身临其境，到实际场景中，用身体去感受，用眼睛去观察，用大脑去思考，用内心去评价……

At the end of the 1990s, with the improvement of the comprehensive strength of the society and the increasing demand for communication in the professional field, the national garden fair began to appear in China. The 1999 Kunming World Horticultural Exposition was held, and the development of China's garden expo was pushed to a world-class level. We can still recall the spring colors, exquisite gardens, bustling crowds and melodious folk dances of the Kunming World Expo Park. Every visitorwas excited, expecting and active. This scene was later in Shanghai, which also performed more prominently in the World Expo. Now, after a lapse of 20 years, the international A1 class world garden expo will once again come to China. What kind of state will Beijing present to the world? We are also looking forward to it.

The world is changing. In the past 20 years, the faces of China's large, medium and small cities have undergone substantial changes. The garden industry has also undergone profound changes, from simple landscaping and beautification to ecological civilization. People are no longer unfamiliar with landscape and gardening. The various levels of world expo, garden expo, green expo, and flower expo are endless. People's understanding of the world expo gradually shifts the focus from appearance to essence, and the issues that the world expo is expected to solve are more comprehensive and more complex, which brings unprecedented challenges to the organizers and designers.

From the perspective of historical development, the world expo carries the development philosophy and development level of a country in a certain historical period, which is a high requirement. The world expo shows the world new ideas, new technologies and new achievements in the development of gardening and horticulture. The Beijing International Horticultural Exhibitionwill be held on the eve of the 70thanniversary of the founding of the New China and the completion of a well-off society. The organizing committee of the Beijing International Horticultural Exhibition proposed to take the 2019 Beijing International Horticultural Exhibitionas an important stage to showcase the achievements of China's ecological civilization construction and promote international exchanges and cooperation in green industries, as an important opportunity of promoting the concept of green development, promoting the mode of economic development and changing the lifestyle of residents, and as a vivid practice of building beautiful China. From this point of view, it is not difficult for us to understand the goal of this International Horticultural Exhibition, "the new realm of world horticulture, and a new paradigm of ecological civilization".

From the perspective of social life, the world expo has to carry the needs of the current social development and people's lives, which is a requirement for breadth. Today's world expo is not just a time-limited exhibition, and it must continue to effectively promote the development of the regional economy and create a good living environment for a wider range of people. So "green life, beautiful home" became the theme of this year's Horticultural Exposition. The world expo needs to pay more attention to the essence, pay attention to landscape and gardening entering the life and serving the public, and needs to pay more attention to the display and exchange between the gardening and gardening practitioners, and promote the progress of the industry, instead of focusing on the shortterm carnival and celebration during the exhibition. The expo park after the world expo will become Beijing's new landmark, a green and ecological garden, which will drive the regional green industry upgrade and tourism economic development to serve Beijing and the whole country.

From the perspective of planning and design, the world expo should reflect the latest concepts and the highest level of landscape planning and design in the emerging stage, which requires depth. In the past 20 years, China's garden landscape industry has flourished, and there are more and more influential design institutions. Like hundreds of flowers bloom and hundreds of schools contend, designers at home and abroad often compete on the same stage, and the design concept is continuously integrated. On the basis of focusing on function and form,designers constantly think about the relationship between man and nature, subjectivity and objectivity, constantly practice the inheritance and innovation of the essence of traditional garden culture, and constantly explore the implementation strategy of ecological concept in regional landscape construction, which can be reflected in the planning and design of this International Horticultural Exposition. The concept of "let the garden integrate into nature and let the nature touch the soul" will open up the inner world of designers and nature, and convey it to the public through design to move every visitor.

Beijing International Horticultural Exhibition will come in 2019. We can imagine such a scene that the core scenic spots around the China Pavilion will become a hot spot for sightseeing, the landscape gardening axis and the world gardening axis will be splendid, and various public attractions and numerous domestic and international exhibition gardens will bring us more surprises. As professionals, we need to think through the appearance if we can capture the trend of world horticulture development through this World Expo, and find the future direction of the industry and even individuals. The papers in this issue can give us a preliminary understanding. More importantly, we must be immersed in the actual situation, use the body to feel, use the eyes to observe, use the mind to think, and use the heart to evaluate…