Smart campus is the information-oriented development trend for colleges and universities. For the purpose of teachers'' better organization of test papers， and students'' better online examination and submission， based on current smart campus systems'' functions and local university A''s smart campus micro-service and micro-application technology architecture， an online examination system based on LAMP （Linux+Apache+MySQL+PHP） is quickly designed by adoption of the agile software development model of Scrum. The server end of the system shares the local university A''s campus application data center， and the client end adopts PHP tool development， leading to this system''s stable performance and convenient operation. Finally， the follow-up research work is proposed： first， a unified campus WeChat public account for the examination system should be created to enhance user experience； second， a cloud-based mobile Internet "office hall" should be built to improve message response speed.