Claim 1: a method to croak a population of plants with improved resistance to soybean cyst nematode of soybean that includes: a) providing a First population of soybean plants； (b) detecting the presence of a genetic Marker that is genetically linked to a CRA S Resistance to soybean cyst nematode of the Link Group B1 by 20 cm or less in the first commIon； (c) to select one or more plants； soybean containing the marker of the first population of soybean plants； and (d) to produce an Offspring population of at least one of the selected soybean plants.Claim 16: a method to create a population of soybean plants that comprises at least one allele associated with enhanced resistance to soybean cyst nematode Sequence that comprises at least one selected from the group consisting of SEQ ID no. 1 to 44, the method comprises The steps of: a) a First Population genotype of soybean plants.This population contains at least one allele associated with enhanced resistance to cyst nematode of soybean；Said at least one allele associated with enhanced resistance to soybean cyst nematode Sequence that comprises at least one selected from the group consisting in the SEQ ID no. 1 and 44； (b) selecting the first Population identified one or more soybean plants containing said to me An allele is associated with enhanced resistance to soybean cyst nematode which comprises at least oneA sequence is selected from the group consisting of SEQ ID no. 1 to 44； and (c) produced from the soybean plants selected a Second Population,Thus creating a population of soybean plants that comprises at least one allele associated with enhanced resistance to soybean cyst nematode Sequence that comprises at least one selected from the group consisting of SEQ ID no. 1 to 44.Claim 18: a method to create a population of plants with improved resistance to soybean cyst nematode of soybean that includes: a) providing a First population of soybean plants； (b) to detect simultaneously the presence of at least a geneti
