Objective To explore the influence of humanistic care on psychological stress in diag-nostic process for patients with lung cancer. Methods 40 suspicious lung cancer patients were divided into the experimental group and the control group according to admission sequence. The control group ac-cepted routine care, the experimental group received humanistic care based upon routine care. Zung's self-rating anxiety scale(SAS) and self- rating depression scale(SDS) were applied in two groups at admission day and 2 days post- diagnosis, the results underwent comparison with norm using t test. Results On ad-mission day 2 groups showed no significant difference in SAS and SDS, 2 days post- diagnosis the SAS and SDS score were evidently lower than those of the control group. Conclusions Lung cancer patients were in anxiety and depression condition during diagnostic process, and humanistic care could effectively relieve their psychological stress.