1. Register a Baidu General Account
First visit http://developers.baidu.com/ to register Baidu General Account.
Enter your info and register.
Access your email, find the email sent by Baidu, then activate your Baidu account
2. Register to Baidu Developer Account
Visit http://developers.baidu.com/ to login use your Baidu General Account.
Then click this link in the following image, register to Baidu Developer Account.
Enter your developer register info in the following image, then submit.
3. After successfully registered as a Baidu developer, then you can create a application and get the API Key
In this page http://developers.baidu.com/ find this link in the following image, create a application.
Then in the next page, click this button to create a application.
Enter a Application Name then click the Create Button in the following image.
After successfully created a application, you can find the API Key in the following image.