In artce [1] .a regressive modcl Y=a +bx+csin(ωx+)

which analyses the economic phenomema withundelate increasing was introduced. It gave us a result which is better than linear regression and the compertzcurve. But it has a stric reguisition to the undulation

It's effect will not be apparent when the undulat range isgreeater and dependency is POOrer. This paper advance a new undulate increasing mathematcal model:where c(x)

ω(x ) are the control variable controling the range of undulation

usually they can be linear.parabala.logarithmic and analyses the date of animal's output from 1980 to 1993 A. D in Xinjiang. This result is satisfactory.