As the same as the great influence of Indusrial Revoluntion and the appearance and application of  information technology, the technique develop so quickly that it enables people change natural environment grearly to a new level. At present, some high tech groups occur such as nano materials, nano electronics, nano biology and nano mechanics and etc.

 Everybody konws that nano is very small long measure. 1nm equals to 1 in 1000 microns or 1 in 1,000,000,000 meters. For the average people or some emloyees in hospital, nano meter is a completely new term. But in fact, it comes to our life, not only in basic science , but also it display its rle at the first time in the medical field.

All substance are made of molecular and atom. The arrange way of them depends on the essence of things. If the molecular of amino acid and DNA and genes have any problem, people will be silk and even has cancer. So to cure the diseas, to solve the molecular problem id first.1nm equals to the length of arrange of 4-5 atoms. Many reactions of chemistry and biology can be explained from the angle of nano meter. The nano technique means the control of atom and molecular or the groups, and enable them arrange completely to be new substance or new functional equipment.

The size of nano is much smaller than the normal cell of human body. It provides a new wany for biologcial research. That particial cure through cell separation or special nano medicine or new typed antibody,etc. 

We usually decided if the fetus has genetic defect  by means of expensive or harmful amniocentesis. At present, it is more convenient and safe to attain the medical results. When woman has been pregant for 8 weeks, a few cells of fetus existed in the blood. It is easy to diagnose the cells by nano granules. Better way and cheaper. It is accurate to estimate whether the fetus has genetic defect. This technique has been used in America...Discovery of cancer has already a difficult topic to solve. But the nano technique can help us to find the cancer cell in early days.

Magnetic nano granules divide the cancer cells from normal cells sucessfully, which shows remarkable prospect for application. As we know, the radical irridiation required  after the cancer operation in order to eliminate the remained cancer cells.But it harmful for normal cells, especially for the medulla cells that has immunity function. To separate the cancer cells from medulla is crucial or the relapse will apear.

 If the magnetic nano granule combine with the  medicine, which are injected into body. By the role of external magnetic , the medicine will be gathered into diseased region to attain the medical effects.  Human cure the diseases basically only by the control of genetic, and the control of genetic will depended on nano tech.

Recently , a nano robot was born at NewYork University, that is the combination of hundreds of atom and molecular. Researhers think that it can see through the body to eliminate the harmful substance anytime. To inspire the cell energy , to keep fit, to live longer. The nano robot which is made of distinctive super-thin nano materials can finsh the treament that beyond people's ability.These robots are very small so that can enter to human body ,and won't be harm to health.

Anti-effective medicine account for one third of all medicien, but it is not ideal. The reason why the anti-effective medicine be failure lies in the bateriors always remain in the dody . The generation of them adapted to the medicine, that's drug resistance.