The objectives of this study are to monitor the status of crab pot fishery resources and production economic in the northern waters off Taiwan. In this study, 11 sample vessel data and three-spotted swimming crab ( Portunus sanguinolentus ) samples were collected to be analyzed. The results indicated LPUE, IPUE, landing, and value had a peak during autumn to winter. The results also indicated that the major fishing season of Crucifix crab ( Charybdis feriata ) and Three-spotted swimming crab were similar. In terms of reproductive biology, the sex ratio ((Female / Female + Male)) were 0.52 to 0.86 during survey periods, higher than 80% in April, June, and August. The female Three-spotted swimming crab carapace width were in a range of 10.1cm to 15.5cm, average value was 11.9cm; the male Three-spotted swimming crab carapace width were in a range of 10.0cm to 15.4cm, average value was 12.3cm. The relationship between Three-spotted swimming crab carapace width and body weigh were linearly related. In addition, we collected ovigerous female full year, the highest percentage of ovigerous female (37.50%) was June; the lowest percentage of ovigerous female (8.52%) was July; the average value of ovigerous female was 22.83%.