Accordmg to the data coilectd from the experiments of different growth stages the seedling of Nortcachus(Bxcrsatella) leachu cirrosus Stimpson which was fed in Fisheries Institute of Fujian Province from December 24 to May 20,a regression ana-lysis ws,s mode by means of TRS-80 microcomputer and models were established.The sea rabbit, the reproductive seedling in winter ana its growth in the next spring as well as its spawn in nature period，is popularly called "Ghun Mu" (Spring mother)by the Amoy people.It has au important place in tha production. The math-ematieal models offered by this article have been discussed connection with tha repx-oduction of the sea rabbit. These scientific principle once applied to the production will surely promote the culturing techniqu) and theory to，new high level.