Detection of law: any import and export clothing, must be checked detector machine, clothing not residual any needle or small iron. Otherwise, give the $10000 to $30000 in economic punishment. In view of this, Japan's first production of needle detector machine brand to HASHIMA. Eighty years American, Taiwan have to follow, also issued a clothing import and export inspection method. In ninety, South Korea, Chinese due to the introduction of a large number of foreign trade products, according to the international practice has been to buy needle detector machine, and began to develop the needle machine production. At the same time also began to nature, the needle machine applicable scope, various technical indicators, operation, maintenance, maintenance and upgrade, needle detector machine troubleshooting, needle detector machine maintenance, from angles of theory and practice exploration.