First we irradiated respectively RNA extracted from cancer cells with laser light at different wavelengths and energy then preheated the cancer cells RNA for 18 hrs and transplanted them into the absominal cavity of C57 DL mice, and observed the influence of carcinoma growth. Result: Ⅰ3250A and 4416A group: no ascitic cancer for six months. Ⅱ.3371A group: ascitic cancer at some parts from the 21th day. Ⅲ.4880A～5145A-group: ascitic cancer caused in all mice from 50 th day, and a part engendered with abdominal cavity consolidatic cancer.