The statement by China's foreign ministry came as Hong Kong's leader Leung Chun-ying hit back at "uncivilised" critics after he was booed and heckled by local residents.
New York-based Human Rights Watch denounced the election plan as a "farce", a "rejection of international law" and a "betrayal of democratic aspirations in Hong Kong".
But Chinese foreign ministry spokesman Hong Lei countered: "We certainly cannot agree with such accusations".
He added that the plan "meets the realities of Hong Kong, accommodates the rights and interests of Hong Kong people and is a viable, reasonable and pragmatic solution".
A senior Hong Kong government source also hit back at HRW's criticism.
"Up until now, no one has ever answered the question what is the international standard for this unprecedented case, the election in the context of a special administrative region under the one country two systems," they said.
That ruling sparked more than two months of mass protests last year.
Britain handed Hong Kong over to China in 1997 under a joint declaration which guaranteed political, social and economic freedoms not enjoyed on the Chinese mainland.
The semi-autonomous city is governed under that "one country, two systems" deal, but there are fears that freedoms are being eroded by increased influence from Beijing.
Protesters booed the pair and blocked their path with yellow umbrellas, a symbol of the democracy movement.
"Yesterday during the district visit... There were some hecklers who kept using loud voices and quite uncivilised words to try to speak over others," Leung told reporters today.
"It's not democratic behaviour," he said. "We don't want to see such scenes at every district visit."
Currently the city's leader is chosen by a 1,200-strong election committee.
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