Abstract: This papar presents preliminary assessment about spin stabilization of satellite-launcher upstage and analyses the influence of the interference factors. The calculated results indicate that the deviation of satellite insertion point orbit parameters not only depends on the character and the influence degree of the interference factors; and relates to the spin speed of satellite-launcher upstage as well. The correct determination of the spin speed of the launcher upstage can diminish the influence of the interference factors on the insention point orbin parameters.