The fixed investment of the fund has always been a risk-free and stable profit in the propaganda of experts. But the actual situation is just the opposite. Every time you make a fixed investment, you have to pay a high subscription fee. Like stocks, funds should buy low and sell high to make a profit. Fixed investment can not guarantee you to buy at a low price, but may also lead you to buy at a high price, resulting in losses. Suggestion: resolutely give up the fixed investment of the fund, choose the growth theme fund, seize the opportunity of decline, and buy at one time, which not only saves the rate, but also is efficient.