Over the past 10 years, in most countries of Europe, North America and China, renewable energy grid integration technical standards are mostly developed by some electricity association or power grid companies. However, with the increasing scale of renewable energy generation and gradually intensified impact on the power grid, more countries confirm the legitimacy of renewable energy grid integration provisions through the legislation in national level. Due to the difference in the power source structure, load characteristics, power grid situation, and other specific circumstances in different countries or regions, grid code of renewable energy integration in different countries are not identical. However, these technical standards have some common focuses. They all stressed that the renewable energy power plants must have a certain active power control, reactive power / voltage control and fault ride through capability as well as the ability to withstand the power system voltage and frequency deviation. Some of the standards require the renewable energy power plants to provide model information, operating parameters and grid integration performance testing reports. This paper provides an introduction about common focus on technical standards of renewable energy grid integration, and tries to explore potential challenge caused by RE grid integration