Not necessarily, a large increase means that the fund's performance is better, at the same time, investors' buying cost will be higher, and there may be less room for the fund's subsequent rise. The rise and fall of the fund is not the standard to judge whether the fund is buying.

To buy a fund, you should choose a fund with low valuation, small retracement and low sharp ratio. Fund valuation determines whether the fund has investment value. The lower the fund valuation, the higher the investment value. Retreat is the interval from the highest to the lowest net value of the fund in a period of time. The lower the fund withdrawal, the more stable the fund is. The greater the Sharp ratio, the higher the risk the fund can bear.