The 2015 general election was the "most disproportionate in British history".
That's according to the Electoral Reform Society.
It's released new research, which shows in London, no MP won more than 50 per cent of the votes in their constituency.
Nationally, an alternative voting system could have created 80 UKIP and 20 Green MPs.
Josiah Mortimer is from the Electoral Reform Society and explains more.