PhD student Jinfeng Zhao completed an internship in Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA) in Madrid of Spain from 2nd March to 31st May 2020. I studied on genome-wide association analysis and regional heritability analysis from SNPs data during the stay. It was a great opportunity to study something interesting and absolutely new for me. I would like to thank Prof. Beatriz Villanueva and Ms. Maria Saura who are very patient, friendly and responsible and taught me all those analysis methods.