The invention discloses a newly discovered cancer promoting effect of DDX24 helicase, a method for realizing a cancer inhibition effect through point mutation and application of the DDX24 helicase. The contents of the invention comprise: 1, high expression of wild type DDX24 has significant correlation with tumor growth, and the growth of tumors can be promoted through high expression of the wildtype DDX24; 2, different from the mechanism of the pathogenic gene DDX24 for familial vascular malformation, DDX24 point mutation including K11E or E271K obviously inhibits the growth of tumors; 3, based on the new function and induced point mutation of DDX24 provided in the invention, a novel targeted therapy method can be provided for treatment of latent and refractory tumors, and a new thoughtcan also be provided for preparation of tumor-related vaccines; and 4, application of 1-3 described above is provided. The point mutation can be used for treating solid tumors including, but not limited to, squamous cell carcinoma of the head and the neck, esophageal cancer, gastric cancer, liver cancer, pancreatic cancer, thyroid cancer, skin melanoma, lymphoma, adenoma, thoracic adenoma, lung cancer, colorectal cancer, gallbladder cancer, kidney cancer, bladder cancer, prostate cancer, breast cancer, ovarian cancer, endometrial cancer, cervical cancer, nasopharyngeal cancer, bone cancer andmalignant myoma.