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A valley current-mode (VCM) controlled buck converter with current source load (CSI) has complex phenomena of fast-scale and slow-scale subharmonic oscillations.The piecewise smooth switching model of the VCM controlled buck converter with CSI is established.It is found that attractive regions of fast-scale and slow-scale subharmonic oscillations exist in the bifurcation diagram,and two tori exist in the corresponding Poincaré mapping.The research results by time-domain simulation indicate that U-type subharmonic oscillation (SO) constituted by SO and frequency-reduced subharmonic oscillation (FSO) exists in inductor current,and sine-type SO constituted by fast scale and low scaie exists in output voltage respectively.Experimental results are given to verify the analysis and simulation results.