You are misinformed. What sources could you possibly have for such charges?
One-party system doesn't mean dictatorship and multi-party can't always be freedom.
The key point is that Chinese have so far done very well and much better than many governments worldwide.
Besides, I can't agree that China should copy the system of Western countries.
We have own characteristics, historically, socially, politically, culturally etc. and the systems working well in other countries may not work in China, so we have to find out a better and more suitable one by ourselves.
Present system of ours works well and is always improving.