1. Tracking target: Investors can choose etf funds with large growth space for tracking target.

2. Tracking error: Tracking error refers to the degree of deviation between the fund and the tracking target. The smaller the tracking error of etf fund, the better. The smaller the tracking error, the closer the trend of fund and the tracking target.

3. Fund managers: Fund managers can choose those who have industry research experience and have long-term fund management, preferably those who have experienced a complete bull-bear transformation, or they can directly choose star fund managers.

4. Historical performance: Historical performance represents the performance of the fund since its establishment. Investors can choose etf funds with high historical performance.