I'm using syfe core growth I realised the return are now negative but I took a look of what have been brought only 1 or 2 china stock. Will it affect alot ?

Syfe Core Growth portfolio is for investors with long term mindset. If your goal is to make money in the short term this portfolio may not be for you.

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"This portfolio is designed to maximise long-term risk-adjusted returns — which is basically just a fancier way of saying you should be comfortable with market volatility in the short term, but in the long run, the growth of the portfolio will outweigh any short term loss." - quoted from moneysmart blog.

You can consider reading up on the rationale behind Syfe's portfolio allocation and see if it is still something that you feel convicted about. If you're not confident about China's growth in the coming years, then perhaps you can consider allocating your investments to a portfolio that has less weight in China equities, without liquidating your current Syfe portfolio.