Verify that you have a valid passport. Verify that you have blank pages on your passport for stamps and seals. You should have at least two blank visa pages.
Obtain a 45mm X 45mm photograph of yourself.
Get the visa application form from the Japanese consulate in Shanghai.
Obtain a Certificate of Eligibility from your employer in Japan. This certificate will act as proof for the purpose of your visit. Make a copy of the certificate.
Apply for the visa at the Japanese consulate in Shanghai. You will need to do this personally or through a travel agent who has been approved by the Japanese embassy or consulate for this purpose.
Submit the Certificate of Eligibility with your application to expedite the processing.