Abstract: On the base of physical simulation codes whose different output power and stimulating conditions coincided to the experiments, the codes for large and small bore copper vapor laser(CVL) were improved and could be used to a series of physical parameters with their figures. If a certain output power of CVL were needed, the lasing volume would be decided. After that if the diameter was given the input power density, the stimulating electric field, the frequency determined by the metastable copper and the wall temperature that decides the Copper vapor pressure were decided.