In 1999, the government believed that China had stolen high technologies from the United States under “The Cox Report”. From now on, high technology products become the gray field against weapons export sanction. The research purpose of the article, how can United States use high technology export control toward China? This article uses “Document Analysis” to analyze the official documents from Bureau of Industry and Security (BIS), Congress Research Service (CRS), General Accountability Office (GAO) to understand export policy in the United States. On the other hand, this article uses the case to describe High Performance Computer (HPC) export to China.