Abstract：Abstract：Through analysis of the databank of Inspection America on field trials of genetic modified crops during the last 20 years between 1986 and 2007, the basic rule and characteristics in research and development of genetic modified crops were studied．Data were processed with the software “data perspective table” method imbedded in Microsoft Excel．Results showed that the field trials undertaken in America by the end of September, 2008 totaled 13782, involving158 crops, more than 1114 novel traits and about 98 companies or institutions．During 1987 and 2008, the number of field trials approved were firstly rising in a straight line, then stabilized at around 1,000 a year．The main test species include corn, soybean and cotton, accounting for 45.8％、9.7%、6.4% respectively． The main characters are involved in the anti-herbicide, insect resistance and quality traits． About 62.7% field trials were undertaken by 5 private companies such as Monsanto and Pioneer Hi-Bred International, Inc．The genetic modified crops which have a high economic value, mature technology and easier accepted have broader prospects．China should continue strengthen non－food crops genetic modified research and pay more attention to the genetic modified food at the same time．We also should build a sound safety of genetic modified production systems and use of transgenic technology for the service of socialist construction．
