In　view　of　the　big　difference　between　pure　electric　vehicles　and　ordinary　vehicles　in　load　characteristics　of　A/C　system,　a　concept　of　`incoming　heat　from　motor　compartment＇　is　introduced.　With　consideration　of　the　effects　of　battery　pack　on　the　cooling　load　of　A/C　system,　both　calculation　and　test　on　the　cooling　load　of　A/C　system　are　conducted　with　the　time-history　curves　of　instantaneous　heat　acquired　from　different　enclosure　structures　obtained　in　both　idling　and　normal　driving　conditions.　Finally　the　results　of　theoretical　calculation　and　test　data　are　compared　and　analyzed,　providing　references　for　further　research　on　the　load　characteristics　of　A/C　system　in　pure　electric　vehicles.