I have question how can I got the investor visa at...

Regarding your inquiry about the investor visa, please note that it is granted to a foreigner who wants to invest his money in the country, based on a certificate issued by the competent authority stating that.
Its validity shall be according to the period specified in the license issued by the competent authority.
 Requirements for obtaining a visa
The age shall not be less than (21) twenty-one years.
The investor or partner must obtain approval from the Ministry of Commerce and Industry to invest within the Sultanate of Oman.
 Required Documents
Submit the application by filling out the electronic form on the Royal Oman Police website, provided that it is approved and certified by the employer or authorized signatory, and printed in Arabic for Arab nationalities and in English for non-Arab nationalities.
Two personal photos (4×6 cm) in size.
A copy of the investor's passport, valid for a period of no less than six months.
The original partnership certificate issued by the Ministry of Commerce and Industry with a copy of it.
A copy of the signature form for partners authorized to sign issued by the Ministry of Commerce and Industry.
Bring the labor license issued by the Ministry of Labor, to be stamped with the seal of an investor.
A copy of a valid Oman Chamber of Commerce and Industry membership card
A copy of a valid commercial register. .
 Fees (50) fifty Omani riyals