Tens of medium stern trawIers from China have fished in the off-shore waters of Eastern Central Atlantic for several years. There is few report,however, On matching towing power, net and otter boards for Chinese vesselsrecently. According to measuring results for these three types of trawler with itsown gear and comparating with foreign trawlers,the drags of net, of otter boardsand of towing ropes in reasonable proportion to total drag are given in this.paper. The method or determing total drag of gear system is also indicated.