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The successful operation of Bitcoin has made its underlying blockchain technology receive wide attention. As the application scenarios of blockchain technology are enriched, the requirements for its performance are getting higher. Therefore, it is of utmost importance to effectively solve the problem of high-performance data interaction in the blockchain. In this paper, based on relevant domestic and foreign research literature, we start from the development history of blockchain technology and review the relevant research work on improving the performance of blockchain from three perspectives: on-chain interaction technology, off-chain interaction technology, and cross-chain interaction technology in turn. The on-chain and off-chain interaction technologies improve performance by improving the architecture of the blockchain system. The performance improvement solution of on-chain interaction technology is to modify and optimize the basic protocol and architecture of the blockchain itself to achieve a performance improvement. Still, the impact of this approach is limited in terms of performance improvement. The performance improvement solution of off-chain interaction technology is to transfer part of the data processing to off-chain and only return the final result to on-chain for storage and recording, which reduces the burden of on-chain operation and improves the efficiency of data processing. In terms of cross-chain interaction technology, this paper analyses four mainstream technology, namely, Notary Scheme, Side chain and Chain relay, Hash-Locking, and Distributed Private Key Control, and ultimately concludes through comparative analysis that cross-chain technology has a significant impact on improving blockchain performance. Finally, the paper provides a systematic overview of the above and an outlook on the possible future development of technologies related to enhancing blockchain performance.

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The impact of technological innovation on economic growth is undeniable, but exactly how it affects China's economic growth still needs to be studied in depth. This paper will collect and collate panel data from 31 provinces and cities in China from 2007-2017, using both input and output aspects of technological innovation, and conduct a regression analysis of the linear relationship between the variables separately using a fixed-effects model. The conclusions drawn indicate that, firstly, capital input and labour input are still responsible for promoting economic growth; secondly, innovation can contribute to economic growth to a certain extent. However, there is still a need to continue to promote the technological innovation system. By region, as there are differences in the development of different regions in China, how to better develop regional economies still needs to be adapted to local conditions.

5G service refers to the mobile services build on the 5th generation telecommunication technology. It enhances end users’ experiences of the mobile internet surfing significantly. The high bandwidth of 5G technologies offers vendors opportunities to provide more value-added services to their customers and therefore improve the revenue. However, the competition in this market is intensive. In order to survive and finally get some payback, the vendors need to analysis the acceptance of 5G services from their consumers’ perspective. In this paper, we use the extended TAM model to investigate the 5G service acceptance in China. We conducted a survey to testify our model and got the results to support our argument. Our study has both theoretical contribution to the people who would like to do research in this area and practical contribution to managers who would like to provide 5G services to their customers.