Abstract: To solve outstanding problem existing in seed production, management and protection of intellectual property rights, this paper put forward the construction of crop variety identity card (ID) and set up variety ID management system. Take example by human ID, The variety commodity information, the fingerprint information, combining with the specific genetic information to construct crop variety which should include three components: part 1 was called commodity code(14 characters), reflect crop, cultivar, and breeding (or approval) region and time ; Part 2 was called fingerprint code(from 20 to 40 characters, depending on different crop type), reflecting the varieties of DNA fingerprint information; Part 3 was called the complement code (specific gene identification number), reflecting specific genetic information of the cultivar, using the letter "T" with the gene name to represent GMO crop, "S" with the gene name to represent MAS crop, and "M" with the gene name to represent mutant line, etc; The complete code was about 50 characters long. Cultivar ID card numbers encoded by this method was highly accurate, versatile, and traceable and would facilitate scientific and standardized management of crop cultivars in China.