I am Ethiopian from uae i need a qatari visa How...

In spite of that your inquiry is not clear about the type of visa you wish to obtain to travel to Qatar, find the following information:
If you want to get a work visa, you must have an employment contract with one of the companies inside Qatar.
Also the employer is responsible for obtaining the visa and work contract and sending it to you on the solution of your residence.
However, if you wish to obtain a tourist visa to Qatar in this case, you will have to have a sponsor, provided that they submit an application for an entry visa for the purpose of tourism.
Among the sponsors allowed to apply for a visa are:
Qatar Airways .
Hotels
You can visit the Qatari Hukoomi website for more details, by using the following link:
Qatari government website