Presently, There are several RAR password recovery tools are proved useful for users to retrieve lost RAR password. I have just used RAR Password Decryption. It supports three attack tyoes: brute-force attack, brute force with mask and dictionary attack which can restrict the search area and shorten the recovery time. Following steps are a simple guide to remove RAR password.
Step 1: Download and install RAR Password Decryption(It is small about 3.5M)
Step 2: Run the program, and click Open to import your locked RAR file
Step 3: Select a attack type that you still remember the type of your password, and then click Start to recover RAR password.
Share it to you,hope it can help you solve the problem.