In the late 1980s, a new X-ray focusing system, X-ray lens, capable of adjusting and controlling high power, white X-ray beams, has been created. This X-ray lens can collect X-rays in a large angle range, increasing the utilization efficiency of an Xray source. It can focus X-rays into a small spot, improving X-ray power density 104 to 106 times when compared to the same source at the same distance without the focusing system. It can also transfer diverging X-ray beam to a nearly parallel one. These properties make the focusing system potentially useful in many Xray applications.