The subscription of ETF refers to the purchase of ETF shares by applying to fund companies or stock exchanges, which generally needs to meet certain conditions and regulations, such as the minimum subscription amount and subscription time. The main purpose of purchasing ETF is to become the holder of ETF and enjoy the benefits and rights of ETF. Buying ETF refers to buying ETF shares directly through securities accounts in the securities market, which is similar to buying stocks. The main purpose of buying ETFs is to invest in ETFs and gain investment income by buying and selling ETF shares. Buying ETF and buying ETF operate in different ways, but both can participate in ETF market and enjoy the investment opportunities and benefits of ETF.