The talk will cover :
(1) Uncertainty induced by the strong coupling alpha _s in the PDF analysis:  PDFs and alpha _s are the main sources of theoretical uncertainties on LHC predictions. They are correlated and often pose a question on the uncertainty estimates of physical measureables. We develop a simply method to disentangle this issue.
(2) New PDFs incorporating the data from combined HERA analysis and the Tevatron W lepton asymmetry;
and (3) progress on NNLO analysis with general mass treatment.