本文给出结果：（１）一类具有不少于［3/8n~2］个一阶细焦点的平面ｎ次系统．（２）一类具有不少于［３/8n~2］族权限环的平面ｎ次系统．

In this paper, we give the following results: (1) A class of planar n-polynomial system with at least [n2] weak focus of order 1. (2) A class of planar n-polynomial system with at least [n2] family limit cycles.