Unfortunately, pure science is a luxury for developing countries. It usually takes 30-50 years for a scientific discovery to bring money. In mathematics, this is up to 200 years. From a monetary perspective, it is an extremely long-term investment with a low return on investment.Unfortunately, China is very bad on funding fundamental science research as a portion of its total R&D budget.
The CEPC is a very good first step and i hope it is completed, however from what I know it is yet to be fully funded (currently funding studies and reports but not for construction)
Still, the funding for these kinds of research is very very low for China.
To give you a figure, for the US, basic funndamental science funding is 20% of its total R&D funding (i.e. 20% of ~3.4% R&D of GDP). While for China funding for the same kind of science is only 6% of its total R&D funding (i.e 6% of 2.4% R&D of GDP)
I mean look at these numbers for China. Dreadful numbers and ridiculously low for a country aspiring to be a scientific powerhouse in the future. And the worst is that on this 5 year plan, they said with great fanfare that the basic science budget will be increased by ~7% annually until 2025. But even with this, at the end of 2025 it is estimated that basic research will have grown as a proportion of total R&D from 6 to 7-8% of total R&D...Look at this number, total joke. While the US is doubling down on this research and it will dramatically increase the budget, China is playing around with this low digit number.
Now, of course as China continues to grow, its R&D (including basic science) will continue to grow naturally as a portion of the GDP, however this 5 year plan unfortunately shows that China places much much more emphasis on applied research than funding fundamental science