Abstract: The japonica rice variety Kongyu 131 had the advantages of early-maturity, high and stable yield and low temperature and cold damage resistance. Since it was introduced into China, it has become one of the important varieties in the northern rice growing area, which played an important role in the food production in this area. By using the specific molecular markers of functional genes such as Pik、Pi1、Pik-p、Pik-m in Pik genetic loci, the genotype of kongyu 131 was detected and analyzed, and the resistance to rice blast was identified in the area with heavy rice blast in Shanghang County, Fujian Province. The results showed that the rice blast resistance gene Pik was contained in Kongyu 131, which showed 0 grade of seedling blast, 4 grade of leaf blast and 3 grade of neck blast in the area with heavy rice blast in Shanghang County, Fujian Province. Therefore, Kongyu 131 could be used as resistant material or breeding material.