The invention relates to a method for accessing a wireless application protocol network, a mobile terminal, a server and a system, wherein the method for accessing the wireless application protocol network comprises the following steps: under the condition that a user selects connecting information for accessing a WAP website, according to the connecting information, access information for accessing the WAP website is generated; the connecting information comprises a website address of the WAP website; the access information is sent to the server of the WAP website by the website address; andthe WAP website is accessed under the condition that the server verifies that the access information is passed. One-time password is generated by user authentication information and an encrypted algorithm, therefore, the user does not need to input password by a keyboard, and the security of the user for accessing the WAP website by the mobile terminal is improved.