您好，复制系统的MACD指标代码，再适当改一改就可以写出来。但您只说开仓，不给平仓规则，策略实际是不完整的。建议您看看官网量化零基础的视频： https://old.tbquant.net/train?id=26

您说的只做空的代码，我给个学习用例供你参考下

Params
	Numeric Lots(1);
	Numeric FastLength(12);
	Numeric SlowLength(26);
	Numeric MACDLength(9);
	
Vars
	Series<Numeric> Diff(0,2); 
	Series<Numeric> DEA(0,2);
	Series<Numeric> MACD(0,2);
Events
	OnBar(ArrayRef<Integer> indexs)
	{
		Diff = XAverage( Close, FastLength ) - XAverage( Close, SlowLength ) ;	
		DEA = XAverage(Diff,MACDLength);
		MACD = (Diff - DEA) * 2;
		PlotNumeric(\"Diff\",Diff);
		PlotNumeric(\"DEA\",DEA);
		If (MACD >= 0)	 
			PlotAuto(\"MACD\",MACD,0,Red,Enum_Bar); 
		Else
			PlotAuto(\"MACD\",MACD,0,Green,Enum_Bar); 
		PlotNumeric(\"零线\",0); 

		If(MarketPosition <> -1 And MACD[1] < 0) SellShort(Lots,Open);
		If(MarketPosition == -1 And MACD[1] > 0) BuyToCover(0,Open);
	}