for example the attri_shader is vm_surface
and there is an attribute for dop_cloth is pointoanimation
。。。。。。。

how can i find the name of attribute i require(ALL—-some of them can't find in the node help?)
or any rules to name it by ourself ?
is there any explain in the help?

thank you!!

Check the helpcards by pressing :?: on the parameter tab. You can see a section called “Local variables”. There's also a good tutorial here:

http://www.sidefx.com/index.php?option=com_content&task=view&id=1500&Itemid=132 [sidefx.com]

attributes and local variables are not the same thing.

one way to find attributes of a node is from the Python shell.
e.g.

node = hou.node(path_to_node)

then start typing

node.parm(

you should see a list of the attributes for that node.