  On the basis of a lattice gas model and the convolution formula with cell
construction scheme, we demonstrate that intermittency in the rapidity-space
with respect to the scaled moments comes from a phase transition between
ordered phase and disordered phase. It is pointed out that as concerns the
power-law behavior of the moments the critical exponent depends on the size of
rapidity interval in the case of the system which is not enough near to the
critical point.
