現代科技的進步日新月異，企業為了創造營收，期望能不斷地研發與創新技術，藉此提升顧客之忠誠度，在學術研究上科技的忠誠度探討，也多半聚焦在技術的本身，如有用性與易用性。人們不斷的思考使用者要何種功能需求時，其實已經忽略了另一個重要的切入角度，就是「使用者在科技使用後的心理感受」，往往才是真正會直接影響到忠誠度的關鍵因素。
在以往探討心理層面影響科技使用的研究中，多半為透過娛樂性與快樂的角度探討使用之意圖，但卻忽略了如何透過快樂的設計進而影響使用者的忠誠度。因此，本研究基於學者盧希鵬的快樂四感理論，針對智慧型手機這項科技進行快樂的設計，冀望透過快樂科技的設計，能進而影響科技使用者的忠誠度。
本研究發現，快樂四感之理論能夠用以成為在智慧型手機科技的設計元素，且透過快樂科技的設計能顯著的影響使用者之忠誠度，而性別與手機平台的不同在快樂與忠誠度上也將造成程度上之不同。最後，在實務管理上本研究發現透過智慧型手機的應用程式數量與人性化的操作介面，能夠有效的提升顧客之忠誠度，而行銷策略上應針對不同的平台與性別選擇不同的重點強化方向。

The advance of technology leads to the change of enterprises nowadays. For the purpose of creating revenue, enterprises consistently develop their R&D and innovation to improve customers’ loyalty. Most academic research on the loyalty of technology is focused on the technology itself such as usefulness and ease of use. When people pay their attention to what functions the customer needs, some important factor, the psychological experience in use of technology, has been ignored. The factor mentioned above will directly affect the customer loyalty.
Past researches on exploring the psychological impact of using technology is more focused on the intention to use by playfulness and enjoyment, but the design of happiness is ignored and thus affects the user's loyalty. In this thesis, the theory of four senses of happiness proposed by Professor Hsipeng Lu was adopted in the design of smart phone to explore the extent that the happiness technology can affect customer’s loyalty in technology.
The experimental results showed that the theory of four senses of happiness can be used to as a design element in the design of smart phone technology, and the customer's loyalty can be significantly affected through the design of happiness technology. It also shows that the differences in gender and mobile phone platform can cause different extent of happiness and loyalty. Finally, in the management practice, the study found that the number of smart phone applications and user-friendly interface can effectively improve customer's loyalty. Regarding to marketing perspective, different platforms and genders would require different strategic directions.

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