Abstract: High velocity impact on long duration and large size spacecraft by meteoroid and space debris is a threat to its safety operation,that can in turn lead to significant damage and catastrophic failure.In order to conduct an accurate assessment of spacecraft module wall damage impacted by debris cloud created by meteoroids and space debris high velocity impact on bumper,the three state material characterization of debris cloud must be known.The analysis model of debris cloud material characterization is presented.The mass distribution of the three states of material in the debris cloud created by a cylindrical projectile impact on bumper is calculated.The mass distribution of the three states of material of projectile and bumper in the debris cloud is also calculated.The mass distribution of the three states of material of debris cloud is different when projectile high velocity impact on bumper with different velocity.As the impact velocity increases,the amount of the debris cloud material subjected to melting and/or vaporization is increase,the damage to module wall is small.When velocity is smaller than 7km/s,the debris cloud is in the state of solid,it has large damage to the module wall.