The court file says that the materials falsely accused Huo of dishonesty, corruption, having a criminal record, and that he was behind media stories questioning the Chinese military background of National MP Dr Jian Yang.
It further states that Auckland Mayor Phil Goff, when he was Labour Party leader, went with Huo to a police station and asked "Police Officer S" to delete Huo's criminal record.
Goff told the Herald there was no truth to the story.
Huo is seeking a declaration of defamation and legal costs. He questioned who authored the material, suggesting it was designed to boost the popularity of Ching as well as divert attention away from the media spotlight on Dr Yang's background.
Crossland said he asked Ching and Su to provide evidence of the claims, "which they didn't and they couldn't because none of it was true".
"This was done very strategically in the lead-up to the election. If you've got a question mark over you, even if it's not true, it might tip them away from voting for Raymond. It was a really nasty thing to have done.
"Many clients would seek aggravated damages, but Raymond just wants his name cleared."
Huo sent cease-and-desist letters to Ching and Su after the material surfaced. Ching and Su subsequently issued a press release saying they did not write the material, though they found the contents interesting and they had shared it among friends.
Court documents say: "The plaintiff's reputation has been seriously damaged, and the plaintiff and his family has suffered considerable distress and embarrassment and, due to the permanent nature of online publication, will continue to have his reputation damaged."
The People's Party won 1890 votes at the 2017 election, or 0.1 per cent of the vote.
Ching stood for Labour in 2005, but stepped aside after allegations he had misused Government connections. Huo was part of the Chings' legal team that defended Ching when that incident was made public.
