台灣地區大專畢業生在剛剛進入勞動市場時有兩個特性，一是失業率較國內平均失業率高，另一則是工作異動頻繁。國內傳統的相關文獻大都集中在探討大專畢業生失業的問題，卻很少觸及後者。然而由於大專畢業生在初入勞動市場時，訊息是非常欠缺的，所以，即使是他們找到第一個工作，也仍然會有很大的機會在短期內更換到其他更適合或薪資更高的工作。因此，本研究主要目地在探討大專畢業生初入勞動市場的工作轉換問題。本研究先建立一個簡單的在職搜尋模型，說明在職搜尋的特性。然後我們再利用期間分析模型及大專畢業生在第一個工作的資料，來檢視導致大專畢業生轉換工作的主要原因為何。我們主要的發現包括：第一，大專畢業生在找到第一個工作後，會有一半的人在一年半內更換工作。第二，工資、教育程度、學用配合度、及工作滿意程度都是影響大專畢業生第一個工作期間長短的重要因素。最後，男性畢業生轉換工作機率會隨著工作期間增加而增加；女性則恰恰相反。 There are two special properties for college graduates in Taiwan when they got their first jobs: First, the average unemployment rate for college graduates is higher than that of the national unemployment rate. Secondly, the frequency of job transition is quite high. Owing to lack of full information, even if they already got their first jobs, college graduates still have a high probability to change to another jobs. The purpose of this paper is to study on-the-search behavior and job transition for college graduates in Taiwan on their first jobs. We apply the 1996 job survey with a duration model to check how and why college graduates change their jobs so quickly. Our main findings are: First, we found that more than half of college graduates changed their jobs within one and half year. Secondly, wage, education level, job match, and job satisfaction are key variables affecting job duration for the first jobs of college graduates. Finally, the probability of job transition is increasing as job duration is longer for male graduates, while the probability is decreasing for female graduates.