The purpose of this study is to propose a simple payment procedure of Mobile Simple-Payment-Service. Industry scale of mobile simple-payment-service is getting bigger. While existing simple-payment-services have focused on Security, but recently user s needs is convenience. We have studied “KakaoPay” and “NaverPay” which have lots of members and recognition. “KakaoPay” and “NaverPay” are going through three steps to make payments using fingerprints and passwords. We have Found that they require long payment steps and a lot of user information so, giving user fatigue. The most important is Simplicity (40.7%) When Choosing the Mobile Simple-Payment-Service According to the Online Shopping Trends Issued material Korea National Statistical Office. Devices for security and Simple payment procedure are needed. To establish a direction for improvement, we derive the ideal simple-payment-service referring to the overseas cases, Alipay and Paypal.