Purpose: The purpose of this study was to test the effects of clinical practice in school on clinical competence in nurse. Method: This study used a quasi experimental post-test design. Data were collected after post-test from April 1, 2005 to May 30, 2005 and from 73 clinical nurses(53 experimental group, 20 control group) who work for 4 General hospitals. Data were analyzed using SPSSWIN 11.5 with $X^2$-test, t-test, Mann-Whitney U-test, and stepwise multiple regression. The experimental group participated in treatment : 4-week consecutive clinical nursing education with preceptor in schooling, and the control group participated in treatment : traditional clinical nursing education with preceptor in schooling. Results: Clinical competence were significantly different between experimental and control groups(t=3.221, p=.002). Clinical competence in nurse is effected by satisfaction of clinical practice in schooling in experimental group(F=14.781, p=.000). Conclusion: 4-week consecutive clinical nursing education with preceptor has an effect on clinical competence in nurse. Therefore we should spread and reinforce the 4-week consecutive clinical nursing education program for improving clinical competence of nurse.