According to the design principle of the index and the actual situation of the market, UDL index is a reasonable improvement of the original index in the Windows analysis system of Qianlong Software. Since the weekly trading is on the 5th day and the January trading is on the 20th day, the parameters of the UDL index are set according to half a week, one week, half a month and January. By synthesizing different moving averages, a mixed trend that can objectively reflect the trend is determined.

　　According to the design principle of the index and the actual situation of the market, UDL index is a reasonable improvement of the original index in the Windows analysis system of Qianlong Software. Since the weekly trading is on the 5th day and the January trading is on the 20th day, the parameters of the UDL index are set according to half a week, one week, half a month and January. By synthesizing different moving averages, a mixed trend that can objectively reflect the trend is determined.

　　computing formula

　　1. Gravity line (UDL)= closing price (N1 simple moving average +N2 simple moving average +N3 simple moving average +N4 simple moving average) /4

　　2.MAUDL=UDL's M-Day Simple Moving Average

　　3. Parameter N1 is 3, parameter N2 is 5, parameter N3 is 10, parameter N4 is 20 and parameter M is 6.