Hi,

How to make a condtion that if the price high crosses up  the moving average 8, the condition is true. Thank you. 

So I am not quite sure what you want. If you want the price bar intersected by the moving average with the high above it:

'|*****************************************************************|
'|*** StockFinder RealCode Condition - Version 5.0 www.worden.com 
'|*** Copy and paste this header and code into StockFinder *********
'|*** Condition:Average Intersects Price Bar
'|******************************************************************
If Price.High > Price.AVGC(8) AndAlso _
	Price.AVGC(8) >= Price.Low Then
	Pass
End If

If instead you want the high to have been at or below the moving average during the previous bar and above it now:

'|*****************************************************************|
'|*** StockFinder RealCode Condition - Version 5.0 www.worden.com 
'|*** Copy and paste this header and code into StockFinder *********
'|*** Condition:High Crossed Up Average
'|******************************************************************
If Price.High > Price.AVGC(8) AndAlso _
	Price.AVGC(8, 1) >= Price.High(1) Then
	Pass
End If

If you want something else, we would need further clarification from you as to what you want.