Hallo
I am trying to simulation a LM338 voltage regulator but den voltage probe can't measure any voltage on the output. Have any some idea to solve this problem
@dajak17,
Welcome to EasyEDA.
Your project is private so only you can see it.
In the meanwhile I'd guess the problem is that you have chosen a schematic symbol that does not have a spice model associated with it.
Please read (3) in:
https://easyeda.com/andyfierman/Welcome_to_EasyEDA-31e1288f882e49e582699b8eb7fe9b1f
You could make something similar to an LM338 model by copying and pasting the LM317EE model into a schematic, renaming the model to LM338 and then editing the user editable (datasheet) parameters based on the datasheet for the LM338:
http://www.ti.com/lit/ds/symlink/lm338.pdf
Then change the name for the LM317EE spice symbol in your schematic to LM338.
This procedure is described, with examples in the link above.
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