The origin parameters for Ne-like Ar 46.9 nm, Ne-like Kr and Ni-like Xe laser by capillary discharge are estimated The impedance characteristic of capillary for different lengths of gas column is investigated both in theory and experiments. Based on “snow-plow" model, the Ζ-pinch evolution in сapillаrу discharge is presented. Calculated and measured results of pinch time are compared.