Combination is the core element of music creation and music analysis theory,which aims to organically organize different musical expression means and various acoustic events together,and then create music works with both internal consistency and external diversity.Jia Daqun's large-scale national instrumental concerto cycle"Pear Garden"fully embodies the multi-level,multi-dimensional and diversified combination characteristics of music creation.Specifically,his works exhibit a combination of dispersion,embedding,and overlapping,as well as fractal,band-like,cross combination form.It also has the combinatorial functions of strengthening the main structure,highlighting the potential properties,blurring the main structure and transforming the primary and secondary structures.The analysis of the internal law and external form of a musical composition is not only a simple musical analysis practice,but also a footnote for the theoretical construction of structural analysis.