Fred Nile's Christian Democratic Party says it is concerned hate speech on social media could impact on a plebiscite on same-sex marriage, in the wake of homophobic election material urging Chinese Australians to vote for the CDP.

The CDP doubled its vote, and said it had out-polled the Greens in seven NSW seats, on the back of an election campaign that targeted Chinese Christian churches with opposition to the Safe Schools program and same-sex marriage.

Fred Nile's party urged Chinese Christian churches to make a stand on same-sex marriage.

But CDP federal director Greg Bondar said his office hadn't authorised controversial Chinese messages that spread across the social network WeChat and were handed out at a booth in Bennelong. One arrived in his letter box.

"I don't want this kind of stuff coming out when a plebiscite is on, without any control, because it then does become dirty, it becomes a bit of a slinging match," Mr Bondar said.