Abstract: The fractal model of urban population density decay,ρ(r)∝r D-d ,was deduced from equations of a general urban dynamic system.On condition that the fractal nature of urban population has degenerated,a Weibull-model-like model of spatial distribution of urban population could be set up as P(r)p 0=1-exprr 0) D,from which a new general model of urban population density,ρ(r)=ρ 0 exp rr 0) D,was derived: when D=1,the new model becomes Clark model,ρ(r)=ρ 0 exp (-rr 0);and when D=2,it b...