The present invention provides an electronic computer-controlled intelligent chest X-ray automatical radiographic method. It is mainly characterized by that: 1.All the internal and external errors of X-ray generating system can be dynamically tracked and modified by use of electronic computer so as to make that into an accurate and standard X-ray generating source; 2.A stepless controlling device of X-ray tube current is designed and used. Under the control of high-resolution D/A converter of the computer, the stepless high accurate control of X-ray tube current can be implemented, and its controlled accuracy is up to about 1mA;3. the double exposure method is adopted. It is depended on the computer to measure practical attenuation amount of patient's chest to X-ray thereby removing artificial error during taking chest film.