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A seminar is held at the Center for Strategic and International Studies in Washington to brief security challenges between China and the US before President Xi Jinping's visit. [Photo by HU YONGQI/CHINA DAILY]

Green also said the US and China are negotiating an agreement not to be the first to use cyberweapons to attack the other's critical infrastructure. No details have been announced concerning this agreement, but experts said cyberattacks should be stopped.

Bonnie Glaser, senior adviser for China Studies at CSIS, said the US and China are both victims of hacking. She said the US and China can figure out one or two areas that both can work together. Some hotlines are needed as a way to find out who one side can talk to the other, she added.

Glaser said information sharing is a good thing but is also going to be a tougher task. "But how to address it (cybersecurity problem)? The way to solve it is not obvious to me," she said. "Personally I am not optimistic of whether the summit could reach consensus or agreement on constrain cyberattacks."

President Xi told the US Secretary of State John Kerry that "the broad Pacific Ocean is vast enough to embrace both China and the United States" in May when Kerry visited China. On the maritime side, the US navy tends to avoid conflicts with China and China also doesn't want any direct encounters of aircrafts or other incidents at sea, Green said.