In addition to mobile terminals, high-end servers will also drive up the overall demand level for HDI. Currently, PCBs with layers below 8 are mainly used for household appliances, PCs, desktop computers, etc., while high-end applications such as high-performance multi-channel servers and aerospace require PCBs with layers above 10. Taking servers as an example, on single or dual channel servers, PCB boards are generally between 4-8 layers, while high-end servers such as 4-way and 8-way require 16 layers or more on the motherboard and 20 layers or more on the backplane. Therefore, HDI boards are more commonly used.

　　The development of the domestic cloud computing market and the rapid expansion of mobile internet such as mobile payments, OTO applications, and social networks have driven the steady growth of the Chinese server market, becoming the main driving force for global shipment growth, and the growth rate is constantly increasing. In 2015, the sales revenue was 49.82 billion yuan, a year-on-year increase of 16.6%. It is foreseeable that more high-end servers will be used for cloud computing in the future. It is expected that the sales revenue of China's server market will maintain an annual growth rate of about 21% from 2016 to 2020, reaching 127.37 billion yuan in 2020.