Abstract:    Innovation ecosystem has the characteristics of complexity, openness, self-organization and habitat. It is an important organizational form for a country or region to carry out innovation. The successful practice of Silicon Valley showed that constructing an innovation ecosystem was a great significance to stimulate the innovation vitality and build competitiveness of a country or region. Under the background of the new round of scientific and technological revolution and industrial reform, group innovation characterized by intelligence, green and ubiquitous has triggered a major adjustment of the international industrial division and disruptive technologies. It is reshaping the world competition pattern and changing the power balance between countries or regions. Implementing innovation driven development has become the general trend of world competition and the core strategy for countries or regions to seek competitive advantage. Focusing on constructing innovation ecosystem has become an important way of implementing innovation driven development.
   China′s economic development has entered the new normal.The important feature is that economic development has changed from factor and investment driven to innovation driven. Innovation has become the fundamental driving force to promote China′s high-quality economic development. In recent years, with the implementation of innovation driven development strategy, China′s innovation driven development has made remarkable achievements. However, there are still some problems, such as weak ability of original innovation, insufficient diversity of innovation subjects, low efficiency of the use of scientific and technological resources, imperfect mechanism of industry-university-research collaborative innovation and transformation of scientific and technological achievements. As a high-level organizational form for carrying out innovation activities, the connotation of innovation ecosystem meets the requirements of innovation driven development and construction a powerful country in scientific and technological innovation. 
    Therefore, following the logic and paradigm of innovation ecosystem, improving the original innovation ability, building a diversified innovation subject and deepening the collaborative innovation of industry-university-research are undoubtedly the key to China′s adhering to innovation driven development and accelerating the construction of a powerful country in scientific and technological innovation.
    The development and application of new generation digital technologies such as big data,AI and IOT have accelerated the transformation of economic and social activities to digitization and profoundly changed all aspects of economic and social development. The embedding of digital technology is profoundly changing the value co-creation mode of innovation ecosystem and the relationship between innovation subjects, and expanding the theory of innovation ecosystem. Therefore, with the advent of the digital economy era, the mechanism of innovation ecosystem evolution under the digital transformation has aroused the attention and thinking of the academia. However, throughout the existing research literature, there are still few research literatures to carry out in-depth discussion on this topic. Basing on this, the paper deeply discusses the reconstruction of innovation ecosystem by digital transformation from the aspects of space-time boundary, species composition and innovation methodology, then the paper focuses on the driving mechanism of innovation ecosystem evolution under digital transformation from the two levels of digital technology and data resources. Specifically, digital technology stimulates high-frequency innovation by reducing the uncertainty of innovation activities; Enhances the integration and generation of innovation ecosystem, improves the integration ability of innovation resources and the accumulation and diffusion speed of innovation knowledge; Strengthens the communication and coordination, deepens the system communication and coordination mechanism etc to drive the sustainable evolution of innovation ecosystem. Data resources stimulate innovation vitality by improving the innovation ecosystem value co-creation model; Promote innovation accelerating iteration, maintains efficient innovation etc to drive the continuous evolution of innovation ecosystem.

Key words: digital transformation, innovation ecosystem, driving mechanism