PAP patients matching the enrollment criteria will enter the study. 1) If requiring the first WLL, they will be randomized to receive WLL (1st level control group) or WLL/ followed by inhaled GM-CSF, according to an acute (12 weeks) followed by maintenance (6 months) schedule (1st level treated group). 2) PAP patients requiring the second WLL: a) the 1st level control group subjects will be randomized to receive WLL alone (2nd level control group) or WLL/GM-CSF (2nd level treated group); b) the 1st level treated group will receive WLL/GM-CSF (1st level re-treated group). 3) PAP patients requiring the 3rd WLL will receive WLL/GM-CSF (2nd level re-treated group). 4) PAP patients not requiring additional WLL, but with persistent lung abnormalities will receive the course of inhaled GM-CSF (Residual disease treated group). At scheduled time, the PAP patients will be evaluated by questionnaire, respiratory function testing, CT-assisted lung profusion score, severity score, quality of life form, clinical chemistry.