Abstract: Barley is the fourth most important cereal crop in the world. It was reported that barley yield is quantitative in nature and many yield QTLs have been identified in different populations. Based on the barley consensus map， its yield QTLs can be alignment from different mapping populations. The clustered QTLs in the semi\|dwarf， photoperiod sensitivity， vernalization and powdery mildew resistance mlo gene regions reveals hot-spots for barley yield. Their effects on yield are commonly explained by pleiotropic effects. The semi-dwarf genes are involved in barley development， while photoperiod and vernalizator are the key factors determining flowering time of barley. The final yield is the product of multiple growth and development processes that occur throughout the barley life cycle. Thats why so many genes have direct and indirect effects on barley yield.

Key words: barley, yield, hot-spot QTL