how i can draw line?
Welcome.
Here are several 'tutorials" that might help you.
http://www.appinventor.org/bookChapters/chapter2.pdf and
may help.
it's using drag, i don't using drag
this my problem, i cannot using drag block
how i can draw line? please help me. i not using drag click, i use button
You mean using buttons to move the drawing object. Sounds like an 'Etch-a-Sketch' clone.
Look at the examples here Wondering bout' this (code an EtchASketch clone)
Those apps seem to do what you would like to do.
anyone can help me how draw line without drag click? i use button. i don't know what i should do in x1 y1 x2 y2
It remembred me Nokia's Iconic Snake game. It seems like you do want to achive smthing like that.
Do you mean snake ? 
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Typo mistake corrected.
Notice how your x1 and x2 values for the line are exactly the same.
Likewise for your y1 and y2 values.
You weren't drawing a line.
You were drawing a dot.