While the layouts converting to pdf some of the features are not visible(visble on layout), may i know wat is the problem,Am using AutoCAD 2012

Are xrefs attached to the drawing?Are some layers turned off?Are some layers frozen?Are these "features" on the layer Defpoints?What "features" are you talking about?

No Ref dwgs, all layers on only,without on the layer how i can see on Layout..?The problem after converting the PDF Some features missing...the same file I tried from another system its came correctly.

By any chance are the objects that are not showing using a white linetype color?By any chance is the plot style you're using changing any of the missing linetypes to a white linetype color?Either of these cases could make the objects "disappear" when plotted.Dave.