Fund purchase is a single purchase. If you want to make a fixed investment, it is also possible. On which platform did you buy the fund? For example, Alipay is this type of platform, and most funds have the function of fixed investment. However, some funds do not open the fixed investment mode, but can open the single subscription mode. If you happen to buy such a fund, then this platform does not support fixed investment and there is no way out. Only a single investment can be made manually. Or you can consider changing a platform where this fund can vote. Generally speaking, the fund's fixed investment is better, and the risk of fixed investment is smaller and more stable than that of single investment. If you were a class A fund at that time, you can consider holding it for a long time, and fixed investment is also a good investment model. The probability of making money from long-term profit is still quite large. You should also increase your income every day, and then you will have more stable income to control your fixed investment expenditure.