i am a nepalese passport holder. and i want to get a working visa for macau so how can i get that ?

You can prepare the documents and then submit the application to the China embassy in Nepal. The required documents include:
1. A completed application form; [Note: The application form is available at the respective Subdivision and the website of the Public Security Police Force.]
2. Copy of the bio data page of a valid passport/travel document;
3. Copy of employment approval document issued by the Macao authorities (i.e. the application or renewal application of "Authorization to Stay for Non-resident Workers" which has been verified by the Macao Immigration Department).