員工工作績效一直是企業最重視的課題，而影響工作績效的因素很多，許多學者研究發現工作績效是由工作職能與工作動機相乘的結果。本研究目的在了解核心職能、工作動機與工作績效的關係，以及探究核心職能及工作動機對工作績效的解釋力，提供個案公司及性質相近公司作為管理上之參據。本研究採用量化研究，以個案公司全體員工內部核心職能評鑑資料及績效考核資料，加上問卷調查全體員工工作動機所獲得資料，利用統計軟體SPSS進行分析與檢定，研究結果發現：(1)工作動機與工作績效有正向關係；(2)核心職能與工作績效具正向關係；和(3)內在工作動機在核心職能上對工作績效有交互作用。因此個案公司和性質相近公司除加強員工核心職能能力之外，也應適切激勵員工內外在工作動機，以提升員工工作績效。

Job performance has been the company's most important issue, and many factors affect job performance, many scholars have found that job performance results from job competency and work motivation. The major purpose of this study was to understand the relations among core competencies, work motivation and job performance, as well as to explore the explanatory power of the core competencies and work motivation to job performance. The result can serve as a reference for the case company in this study and its similar company its for better management. Employing a approach, this study used the ready data of all employees’ survey around the case company employees’ core competencies and performance appraisal, combined with a survey of their work motivation. Ths SPSS statistical software was used for data analysis and test. The results of this study are as follows：(1) Work motivation positively correlates with job performance； (2) Core competency positively correlates with job performance； and (3) The interaction between work motivation and core competencies to job performance exists. Therefore, the case company and in this study its similar companies should not only improve their employees’ core competencies, but also inspire their employees’ intrinsic motivation and extrinsic motivation to promote their employees’ job performance.

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