thank you, I notice that when I choosed different enzyme types such as trypsin 
and formic acid D_C in different non-specific searches with the other parameters 
unchanged, I got two different results finally. That means the enzyme type could 
affect the final result even in the non-specific type. 
When I search endogenous peptides in Mascot or Peaks, the "none" enzyme type is 
suggested in manual. 
Is there perferred enzyme type in pFind when I search endogenous peptides ?