With the technology improving, many content-services have been digitalized constantly in our daily life. To be more convenient and efficient, many kinds of high technological products have also been personalized, mobilized, and people can handle their businesses at any time from anywhere. For example, mobile users can perform the Internet transactions via mobile devices (such as cell phone and Personal Digital Assistant). Nowadays, the cell phone is not only used in communication, but it can be combined with Personal Digital Assistant (PDA) functions. The progress of technology makes the commercial activities efficient; moreover, it also provides consumers with more convenient and intimate services. On the basis of the tendency, we implement a digital valueadded services platform via PDA in this research. We integrate the related cryptography mechanisms (for example: public key, secret key cryptography system and digital signature) wireless and SQL technologies to construct a real-time and secure mobile ticket system. The consumer can use a mobile device to get a requested value-added service such that the buyers and sellers can perform a secure transaction. Therefore, the security and reliability of the system are assured in our scheme.