Mainland wives said the decision to allow thousands of children to come to Hong Kong would damage families.
The court ruling ignored mothers and would leave youngsters home alone.
'Once they start allowing illegitimate children in, people like me will have to wait another 10 years,' said a mainland wife who has been waiting for nearly 10 years to move to Hong Kong.
'This will only encourage more men to find mistresses across the border because now they can bring the offspring to Hong Kong,' she predicted.
A maximum of 150 mainlanders are allowed to immigrate each day, with 60 spaces reserved for children, 60 for those with sick elderly parents or an inheritance to receive, and only 30 for wives.
The new ruling states that all children have an equal chance, with no indication that those who had waited the longest could go first.